NASA Venus Mission Surprise: There Could Be Life Existing On Earths Twin – International Business Times

For many years, humans have been wondering if there are alien beings from other planets or galaxies. We even ask ourselves and say, Is there life outside our world?

Whats interesting is that we are often bombarded with news of possible aliens, UFOs and ancient fossils that suggest that there could be life outside of Earth yet none of them have actually been accepted by the general scientific community.

Now per a report, a new study is suggesting that yes, there might be life outside of Earth and it can be found no less than on the planet with the most extreme conditions - Venus. According to research published on Nov. 10 by Dr. Rhawn Joseph in Nature/Springer journal Astrophysics and Space Science, "Yes, there is life on other worlds. However, our neighbors are not human, but mushroom-shaped fungi dwelling on the surface of Venus and Mars.

There came doubts and questions about this statement. Is there life on Venus? Is that really possible? Dr. Dirk Schulze-Makuch indicated that life may have been transmitted from Earth to our neighbors, Venus and Mars, through meteors which banished out from our planet.

Fungi, in fact, are great survivors. Fungi have populated the most environments of Earth, including places that are affected by nuclear events. Other scientists and researchers have also toyed with the idea that Venus may be home to different creatures, mostly fungi. However, Dr. Joseph was the first one to show photographic evidence of these mushroom-shaped specimens.

Dr. Rudolf Schild of the Dept of Astrophysics at the Harvard-Smithsonian checked out the photos and agreed: "These specimens look just like mushrooms."

Venus is an impossible habitation for any creature, which some have compared to Hell due to its surface temperature of 465.85 degrees Celsius. There are no known Earthly organisms that can survive above 300 degrees Celsius. Thats why some scientists already concluded that it is impossible for living creatures to survive on Venus unless they have evolved.

Is there water in Venus? Many scientists consider that there is great water in the clouds of Venus. In the article Life on Venus by Dr. Joseph, he reasoned out there is water beneath the ground as well. He even used the deserts of Earth on how the water gives life to living creatures and organisms. In Dr. Josephs published article Astrophysics and Space Science, he said, "The hyper-arid, waterless surface of Venus may draw moisture and water up from the subterranean depths, just as occurs in the arid deserts of Earth. If so, then any organisms living below ground may be continually supplied with water as it rises to the surface."

Many scientists believe that billions of years ago Venus was a wet planet with streams, rivers, oceans and lakes where life probably evolved.

An artists illustration shows Venus Express in orbit around the planet. Photo: ESA

More:

NASA Venus Mission Surprise: There Could Be Life Existing On Earths Twin - International Business Times

Why Astronomers Worry About the Brightness of SpaceX’s Starlink Satellite Megaconstellation – Space.com

SpaceX is planning to launch the second installment of its Starlink megaconstellation on Monday (Nov. 11), and astronomers are waiting to see well, precisely what they will see.

When the company launched its first set of Starlink internet satellites in May, those with their eyes attuned to the night sky immediately realized that the objects were incredibly bright. Professional astronomers worried the satellites would interfere with scientific observations and amateur appreciation of the stars.

"That first few nights, it was like, 'Holy not-publishable-word,'" Jonathan McDowell, an astrophysicist at the Harvard-Smithsonian Center for Astrophysics, told Space.com. "That kind of was the wake-up call."

Related: SpaceX's 1st Starlink Internet Satellite Megaconstellation Launch in Photos!

SpaceX and its leader, Elon Musk, reassured astronomers that once the satellites settled into place, they would stop masquerading as the stars they are named for. McDowell wanted to confirm the accuracy of Musk's statement, so he asked an email Listserv of amateur astronomers to wait for the first batch of Starlink satellites to reach their final orbit, then compare the brightness of specific satellites to the stars around them.

Those observations started in July. McDowell hasn't completed an exhaustive analysis, but he said the preliminary results are concerning, with Starlink satellites regularly clocking in at magnitudes between 4 and 7, which is bright enough to see without a telescope. "The bottom-line answer is, you can consistently see these things," he said.

The initial Starlink launch carried 60 satellites, but that's just a tiny fraction of what SpaceX has described as its long-term plan, of launching tens of thousands of the devices in orbit. "When you're talking about 30,000 satellites, and many above the horizon at any one time, that's what's new about this," McDowell said. "It's not going to be just the occasional interference, it's going to be continual."

McDowell and his colleagues specializing in optical astronomy aren't used to having to ignore technology masquerading as astronomy. But it's a position radio astronomers are quite familiar with, since satellites send data back to their humans in radio frequencies. "That was something that people realized was coming," he said, "whereas the light-pollution aspect caught us by surprise."

In response to the outcry, Musk said in May that he "sent a note to Starlink team last week specifically regarding albedo reduction," which refers to the amount of light reflected by the satellites. In a separate tweet regarding the issue, Musk also said that SpaceX doesn't intend to interfere with optical astronomy. "That said, well make sure Starlink has no material effect on discoveries in astronomy. We care a great deal about science," he wrote.

But McDowell complained that SpaceX hasn't provided any details about what modifications the satellites could endure and how much they would dim. He hopes to repeat his brightness check once the Starlink satellites that SpaceX plans to launch next week reach their final orbits.

"We can hope that that will improve things, but let's see, the proof is in the pudding, right?" he said. "All we can do right now is go on what they've actually put up there. And what they've actually put up there are really bright satellites that if you had many thousands of them would represent a serious change to the night sky."

For McDowell, the concern is about more than Starlink or SpaceX specifically. "This whole new scale of space industrialization means that this is a problem that we have to start worrying about, and in fact, should have started worrying about 10 years ago," he said. "I'm not trying to say we absolutely shouldn't do megaconstellations. But let's phase it in, let's assess the degree of light pollution, let's manage it as a resource."

He hopes that the space community adopts general practices about how much light pollution individual projects can produce, paralleling existing guidelines for managing space debris. "We thought we could ignore the space age in astronomy, but it's here," McDowell said. "Now we have to take it seriously and deal with the impacts on ground-based astronomy."

Email Meghan Bartels at mbartels@space.com or follow her @meghanbartels. Follow us on Twitter @Spacedotcom and on Facebook.

Need more space? Subscribe to our sister title "All About Space" Magazine for the latest amazing news from the final frontier!

(Image credit: All About Space)

More:

Why Astronomers Worry About the Brightness of SpaceX's Starlink Satellite Megaconstellation - Space.com

The most spectacular celestial vision youll never see – Astrobiology Magazine

Contrary to previous thought, a gigantic planet in wild orbit does not preclude the presence of an Earth-like planet in the same solar system or life on that planet.

Whats more, the view from that Earth-like planet as its giant neighbor moves past would be unlike anything it is possible to view in our own night skies on Earth, according to new research led by Stephen Kane, associate professor of planetary astrophysics at UC Riverside.

The research was carried out on planets in a planetary system called HR 5183, which is about 103 light years away in the constellation of Virgo. It was there that an eccentric giant planet was discovered earlier this year.

Normally, planets orbit their stars on a trajectory that is more or less circular. Astronomers believe large planets in stable, circular orbits around our sun, like Jupiter,shield us from space objectsthat would otherwise slam into Earth.

Sometimes, planets pass too close to each other and knock one another off course. This can result in a planet with an elliptical or eccentric orbit. Conventional wisdom says that a giant planet in eccentric orbit is like a wrecking ball for its planetary neighbors, making them unstable, upsetting weather systems, and reducing or eliminating the likelihood of life existing on them.

Sometimes, planets pass too close to each other and knock one another off course. This can result in a planet with an elliptical or eccentric orbit. Conventional wisdom says that a giant planet in eccentric orbit is like a wrecking ball for its planetary neighbors, making them unstable, upsetting weather systems, and reducing or eliminating the likelihood of life existing on them.

Questioning this assumption, Kane and Caltech astronomer Sarah Blunt tested the stability of an Earth-like planet in the HR 5183 solar system. Their modeling work is documented in a paper newly published in theAstronomical Journal.

Kane and Blunt calculated the giant planets gravitational pull on an Earth analog as they both orbited their star. In these simulations, the giant planet often had a catastrophic effect on the Earth twin, in many cases throwing it out of the solar system entirely, Kane said.

But in certain parts of the planetary system, the gravitational effect of the giant planet is remarkably small enough to allow the Earth-like planet to remain in a stable orbit.

The team found that the smaller, terrestrial planet has the best chance of remaining stable within an area of the solar system called the habitable zone which is the territory around a star that is warm enough to allow for liquid-water oceans on a planet.

These findings not only increase the number of places where life might exist in the solar system described in this study they increase the number of places in the universe that could potentially host life as we know it.

This is also an exciting development for people who simply love stargazing. HR 5813b, the eccentric giant in Kanes most recent study, takes nearly 75 years to orbit its star. But the moment this giant finally swings past its smaller neighbor would be a breathtaking, once-in-a-lifetime event.

When the giant is at its closest approach to the Earth-like planet, it would be fifteen times brighter than Venus one of the brightest objects visible with the naked eye, said Kane. It would dominate the night sky.

Going forward, Kane and his colleagues will continue studying planetary systems like HR 5183. Theyre currently using data from NASAs Transiting Exoplanet Survey Satellite and the Keck Observatories in Hawaii to discover new planets, and examine the diversity of conditions under which potentially habitable planets could exist and thrive.

Go here to see the original:

The most spectacular celestial vision youll never see - Astrobiology Magazine

Clemson scientists further refine how quickly the universe is expanding – Clemson Newsstand

From left, Clemsons Marco Ajello, Lea Marcotulli, Abhishek Desai and Dieter Hartmann were co-authors on a newly released paper in The Astrophysical Journal.Image Credit: College of Science

CLEMSON, South Carolina Wielding state-of-the-art technologies and techniques, a team of Clemson University astrophysicists has added a novel approach to quantifying one of the most fundamental laws of the universe.

In a paper published Friday, Nov. 8, in The Astrophysical Journal, Clemson scientists Marco Ajello, Abhishek Desai, Lea Marcotulli and Dieter Hartmann have collaborated with six other scientists around the world to devise a new measurement of the Hubble Constant, the unit of measure used to describe the rate of expansion of the universe.

Cosmology is about understanding the evolution of our universe how it evolved in the past, what it is doing now and what will happen in the future, said Ajello, an associate professor in the College of Sciences department of physics and astronomy. Our knowledge rests on a number of parameters including the Hubble Constant that we strive to measure as precisely as possible. In this paper, our team analyzed data obtained from both orbiting and ground-based telescopes to come up with one of the newest measurements yet of how quickly the universe is expanding.

The concept of an expanding universe was advanced by the American astronomer Edwin Hubble (1889-1953), who is the namesake for the Hubble Space Telescope. In the early 20th century, Hubble became one of the first astronomers to deduce that the universe was composed of multiple galaxies. His subsequent research led to his most renowned discovery: that galaxies were moving away from each other at a speed in proportion to their distance.

Hubble originally estimated the expansion rate to be 500 kilometers per second per megaparsec, with a megaparsec being equivalent to about 3.26 million light years. Hubble concluded that a galaxy two megaparsecs away from our galaxy was receding twice as fast as a galaxy only one megaparsec away. This estimate became known as the Hubble Constant, which proved for the first time that the universe was expanding. Astronomers have been recalibrating it with mixed results ever since.

With the help of skyrocketing technologies, astronomers came up with measurements that differed significantly from Hubbles original calculations slowing the expansion rate down to between 50 and 100 kilometers per second per megaparsec. And in the past decade, ultra-sophisticated instruments, such as the Planck satellite, have increased the precision of Hubbles original measurements in relatively dramatic fashion.

The teams analysis paves the way for better measurements in the future using telescopes from the Cherenkov Telescope Array.Image Credit: Photo courtesy of Daniel Lpez/IAC

In a paper titled A New Measurement of the Hubble Constant and Matter Content of the Universe using Extragalactic Background Light-Gamma Ray Attenuation, the collaborative team compared the latest gamma-ray attenuation data from the Fermi Gamma-ray Space Telescope and Imaging Atmospheric Cherenkov Telescopesto devise their estimates from extragalactic background light models. This novel strategy led to a measurement of approximately 67.5 kilometers per second per megaparsec.

Gamma rays are the most energetic form of light. Extragalactic background light (EBL) is a cosmic fog composed of all the ultraviolet, visible and infrared light emitted by stars or from dust in their vicinity. When gamma rays and EBL interact, they leave an observable imprint a gradual loss of flow that the scientists were able to analyze in formulating their hypothesis.

The astronomical community is investing a very large amount of money and resources in doing precision cosmology with all the different parameters, including the Hubble Constant, said Dieter Hartmann, a professor in physics and astronomy. Our understanding of these fundamental constants has defined the universe as we now know it. When our understanding of laws becomes more precise, our definition of the universe also becomes more precise, which leads to new insights and discoveries.

A common analogy of the expansion of the universe is a balloon dotted with spots, with each spot representing a galaxy. When the balloon is blown up, the spots spread farther and farther apart.

Some theorize that the balloon will expand to a particular point in time and then re-collapse, said Desai, a graduate research assistant in the department of physics and astronomy. But the most common belief is that the universe will continue to expand until everything is so far apart there will be no more observable light. At this point, the universe will suffer a cold death. But this is nothing for us to worry about. If this happens, it will be trillions of years from now.

But if the balloon analogy is accurate, what is it, exactly, that is blowing up the balloon?

Matter the stars, the planets, even us is just a small fraction of the universes overall composition, Ajello explained. The large majority of the universe is made up of dark energy and dark matter. And we believe it is dark energy that is blowing up the balloon. Dark energy is pushing things away from each other. Gravity, which attracts objects toward each other, is the stronger force at the local level, which is why some galaxies continue to collide. But at cosmic distances, dark energy is the dominant force.

Lead author Alberto Dominguez of the Complutense University of Madrid is a former postdoctoral researcher in Marco Ajellos group at Clemson. Dominguez is shown here at the Roque de los Muchachos Observatory in La Palma, Spain.Image Credit: Photo courtesy of Alberto Dominguez

The other contributing authors are lead author Alberto Dominguez of the Complutense University of Madrid; Radek Wojtak of the University of Copenhagen; Justin Finke of the Naval Research Laboratory in Washington, D.C.; Kari Helgason of the University of Iceland; Francisco Prada of the Instituto de Astrofisica de Andalucia; and Vaidehi Paliya, a former postdoctoral researcher in Ajellos group at Clemson who is now at Deutsches Elektronen-Synchrotron in Zeuthen, Germany.

It is remarkable that we are using gamma rays to study cosmology. Our technique allows us to use an independent strategy a new methodology independent of existing ones to measure crucial properties of the universe, said Dominguez, who is also a former postdoctoral researcher in Ajellos group. Our results show the maturity reached in the last decade by the relatively recent field of high-energy astrophysics. The analysis that we have developed paves the way for better measurements in the future using the Cherenkov Telescope Array, which is still in development and will be the most ambitious array of ground-based high-energy telescopes ever.

Many of the same techniques used in the current paper correlate to previous work conducted by Ajello and his counterparts. In an earlier project, which appeared in the journal Science, Ajello and his team were able to measure all of the starlight ever emitted in the history of the universe.

What we know is that gamma-ray photons from extragalactic sources travel in the universe toward Earth, where they can be absorbed by interacting with the photons from starlight, Ajello said. The rate of interaction depends on the length that they travel in the universe. And the length that they travel depends on expansion. If the expansion is low, they travel a small distance. If the expansion is large, they travel a very large distance. So the amount of absorption that we measured depended very strongly on the value of the Hubble Constant. What we did was turn this around and use it to constrain the expansion rate of the universe.

Read the original post:

Clemson scientists further refine how quickly the universe is expanding - Clemson Newsstand

A gifted physicist reduced to living in his car: what killed Hamid Alamdari? – The Guardian

Hamid Farahi Alamdari was full of stories. When he was living out of his car in a Tesco car park in Harlow, Essex, he told anyone who would listen about his exciting past as an avionics engineer, Iranian war veteran and physicist. Then there was his pice de rsistance: the time he was shortlisted to be Stephen Hawkings assistant. I took it all with a pinch of salt at first because he was telling me all these stories and I could tell he was a drinker, says account manager Adam Protheroe. He could have been anybody. He could have told me that he was the king of Iran and I wouldnt have known any better.

Protheroe became close friends with Hamid in 2017. Id seen him around and he was living in a Peugeot 206 that was parked up just around the corner. I came back a couple of days later with a bag full of clothes and bits and pieces and socks. My wife cooked him a nice meal and I took it down to him in a little box and started talking to him from there.

He would eat with him, take him to appointments and raised more than 700 to get Hamid accommodation in the winter that followed. Protheroe wasnt bothered whether he was telling the truth or not. He liked Hamid, and who wouldnt spin a yarn or two when life had dealt them such a bum deal?

726 homeless people died in England and Wales in 2018, according to the latest ONS figures. Over the next few months, G2 and Guardian Citieswill look behind this statistic to tell the stories of some of those who have died on Britains streets. We will tell not just the story of their death, but the story of their life what they were like as kids, what their dreams were, their hobbies, what people loved about them, what was infuriating. We will also examine what went wrong with their lives, how it impacted on their loved ones, and if anything could have been done differently to prevent their deaths.

As the series develops, we will invite politicians, charities and homelessness organisations to respond to the issues raised. We will also ask readers to offer their own stories and reflections on homelessness. We want the stories we tell to become the fulcrum of a debate about homelessness; to make a difference to a scourge that shames us all.

It is time to stop just passing by.

Protheroe was by no means the only one to fall for Hamids raffish charm. Many of the locals had a soft spot for the bearded stranger with the laughter lines and exotic accent. Hamid chatted to his new friends about literature and science, spiritualism and martial arts, Iraq and war, pretty much anything. And then one day he was gone. Just as he had arrived unannounced, he disappeared. In February 2018, Hamid was taken ill and moved into emergency accommodation. He died there alone. Like two-thirds of homeless people, Hamid suffered with addiction. And like many people who die homeless, he looked far older than his 55 years.

Harlow is one of the new towns built after the second world war to ease overcrowding in London. In its early years it had a thoroughly modern can-do feel to it, boasting Britains first all-pedestrian shopping precinct and first modern high-rise residential tower block. But more recently it has fallen on tough times. This year, Harlows Conservative MP, Robert Halfon, suggested the town had become a dumping ground for London councils, which have sent hundreds of troubled families to live in converted office blocks in his constituency. The last census, in 2011, showed that Harlow had higher unemployment, less home ownership, lower educational qualifications and poorer health than the average for both Essex and England.

In June, however, Halfon said things were looking up for the town. The news that homelessness is at its lowest level since 2010 is a real step in the right direction, he declared. Halfon quoted the absurdly low figure of five homeless people, and was soon corrected by a local Labour councillor, Tony Edwards, who pointed out that the figure referred to rough sleeping not homelessness, and that in fact more than 4,500 people were on the housing-needs register in Harlow and about 400 people had made homeless applications in 2018/19. That paints a very different picture. It means that, with a population of 85,000, 5.3% of people in the town are waiting to have a housing need met.

It is 18 months since Hamid died, and we meet Protheroe in the Tesco superstore cafe where he and Hamid would often get together for coffee and bacon sandwiches. Protheroe is business-like and comes straight to the point. He says he doesnt want us to get the wrong impression; hes not a do-gooder. He considered Hamid a friend rather than a charity case. Im not a selfish bastard, but Im not out to help everybody I can, he says. If anything, Ill help animals more than Ill help people. I just got to know Hamid and we became mates.

Hamid told Protheroe he had ended up homeless in 2017 after selling his pension in a dodgy deal and then running into money troubles. But even here there is a mystery. Unlike most people living on the streets, he still had savings in the bank. He camped in woodland close to Tesco until his tent was set alight. Protheroe says Hamid told him that teenagers were responsible, but he didnt like to talk about it.

Soon after this a Harlow local gave Hamid the old Peugeot 206. He parked it by Tesco and moved in. The interior of his car-home was crammed with donated clothes and books science books, spiritual self-help guides, novels, all sorts. The only space left for Hamid was the passenger seat. Protheroe thought his friend might be an eccentric hoarder.

He was very educated. But something obviously went wrong somewhere along the line

Hamid told him he spoke seven languages, that he had a PhD in astrophysics and theoretical maths, and mentioned the job he almost got with the late Prof Hawking. He also talked about fighting in the Iran-Iraq war, showed him photographs of members of his platoon who had died, and told him he suffered from terrible flashbacks. Thats why he drank, he said to blot out the memories. Protheroe is surprised by how well they got to know each other in such a short period of time. He would find himself visiting Hamid at night to make sure he was OK.

Although Hamid was a good deal older, 41-year-old Protheroe found himself playing a paternal role. He would often tick Hamid off about the state of his car-home. Id open up the car door and hed been smoking roll-ups in there. I said youve got to sleep in there, and theres smoke billowing out. It wasnt the kind of car I would have liked to have slept in, if Im being honest. Hamid wasnt very tidy. Id have a go at him Sort yourself out, you look like a sack of shit, you need to run a brush through your hair. Id just have a dig at him and wed have a bit of back and forth. Hed laugh at me, and take the piss.

Like Protheroe, Chrissy Sorce is almost apologetic about befriending Hamid. I dont know why I took to him. I dont go out and randomly do that to everybody. Its just something about him he was likable. Sorce, who is 51, works at a car-rental firm based in the industrial park next to Tesco. He parked the Peugeot behind our workplace, and I just started chatting to him on my fag breaks, she recalls.

Sorce talks about his fondness for scratch cards He was always trying to win millions, bless him and how she stored books for him in her daughters shed to free up space in the Peugeot. They were quite intellectual books. He was very educated. But something obviously went wrong somewhere along the line, which can happen, cant it?

Hamid told Sorce many fascinating and funny stories. But for all that, there was a terrible vulnerability about him, she says. It was all a fake, really, because at the end of the day he was still lying in that car and sleeping in the freezing cold. Sometimes when he was drunk he would weep and tell her he wished he was dead. Sorce says she told him not to be daft, and to take any opportunity that came along. But she admits, at this stage of his life, few opportunities were coming his way. I think the council could have housed him. He could have been put in a room a lot sooner, surely. They all knew where he was.

What she most liked about Hamid is that he didnt want anything from her. He never even asked me for a pound. She pauses and smiles. He did ask me to go out for dinner, though, but I had to let him down and say no. I think he liked the women. He would go into Tesco and chat to them. She once did his washing for him, she says. I washed and ironed everything. I said to him: Do you want me to do any more? But he never gave me any more to do. He was proud. After I did that, he went out and bought me washing powder to replace what Id done. I told him not to bother, but he did it anyway.

She knows some people couldnt understand why she wanted to help him. They said it straight out to her. When I took home his washing and yes, it really did stink one of my managers said: Eeeeugh, how could you wash all his clothes? I said: Easy, you just put them in the washing machine and take them out. Sorce says she couldnt help thinking it could just as easily have been her living in that car. Were all one pay cheque away from being homeless. You never know whats going to bring you down, thats how I see it.

At times, she says, Hamid seemed confused. She and Protheroe believe he had early-stage dementia. As for his stories, she didnt know what to make of them. You never know whats true and whats not, do you? You just go along with it.

Both Sorce and Protheroe were anxious that Hamid should take care of his appearance. They believed that this, coupled with sobriety, could be the difference between him getting a council home or not. Thats why Protheroe ended up taking him to his barbers one day. Hamid was attending an alcohol dependency therapy group in Harlow, says Protheroe. The idea was that, if he demonstrated he could get off the booze, they would recommend that the council should give him somewhere to live. I was trying to sober him up and make him look a bit more respectable. So I took him to my barber. Hamid had this big old white Father Christmas beard and he took all that off, cut his hair and he looked like a different person.

It was at the barbers that Protheroe began to suspect Hamid may have been telling the truth about his academic background. My barber is a very intelligent guy, and him and Hamid were having conversations about string theory, this theory, that theory. It was really bizarre to hear Hamid coming out with these things.

Hamid never did get council accommodation, but Protheroe says in some ways he was his own worst enemy. The Harlow homeless project Streets2Homes tried to find a place for Hamid to live. Theyd say: Weve got a room for you, but you cant drink or smoke in the room, and there are all these rules and regulations. Hamid was like Nononono, Im not having that. And he just wouldnt do it. If you want help, first of all youve got to help yourself. Hamid was like: Id rather sit in my car and drink and smoke.

Protheroe admits he may be being tough on his friend insisting that an alcoholic does not drink in his own home is a big ask. Hamid may well have benefited from the Housing First model, whereby homeless people are provided with a home and then addiction issues are addressed with wraparound support. Streets2Homes declined to talk to us for this article.

There was also something about the car-home that made Hamid special. He was well known to Tesco customers and became something of a local celebrity. Hamid and his Peugeot had become a landmark. Protheroe reckons Hamid had good reason to be wary of council accommodation. He tells us of the time Hamid was robbed while staying in a hostel. He had his bloody pin number written on his bank card and whoever it was that stole it from the hostel emptied his bank, absolutely emptied his bank. So I was on the phone to his bank and tried to get it all sorted out. He had a couple of grand in the bank; that was what was left over from his pension.

Sorce thinks Hamid declined offers of housing because they were not permanent, and he felt he would be even more exposed there. He wanted to steer clear of people who were similar to him, she says. Hamid told her he was offered a place at Terminus House in Harlow, a grim-looking block of flats often described as a human warehouse where hundreds of residents, sent from councils across London, are crammed together in tiny flats. Halfon has referred to the practice of rehousing families from London in his constituency as social cleansing. The building made headlines in July because of a drugs network operating nearby, and police figures show that crime within a 500-metre radius of Terminus House rose 20% in the 10 months after it opened.

Rather than accepting a place in Terminus House, Hamid returned to his silver Peugeot, carried on smoking and drinking, and continued to be berated by his good friend for his slovenliness. Protheroe says that somehow Hamid, for all his bad habits and obduracy, brought out an incredible generosity in the Harlow community. One day Hamid broke the key in the lock of the car door, and Protheroe posted a shout-out on Facebook for help. This guy got in touch, came down, and sorted him with a key. It was normally a 200 job, but he did it as a gesture of goodwill.

When the weather turned and Protheroe was worried Hamid might get hypothermia, he set up a GoFundMe page. A kind-hearted girl phoned me up around midnight, and said: I cant stop thinking about this guy. I want to come out and help him. I said: Right, Ill get out of bed and come and meet you. She and her husband drove down in a hundred grand Mercedes AMG Jeep. They paid 400 or 500 quid to put him up in the Park Inn for a week.

Another woman turned up with a huge biscuit tin crammed with cigarettes. It was filled to the brim. There must have been a couple of thousand roll-ups in it. And soon after it became apparent that there was no longer room for Hamid in the Peugeot, another miracle happened. A guy rocked up with an Audi estate car, which was like twice the size of his existing premises. He parked that up behind, and the Peugeot became a storage facility for all the junk while Hamid moved into the Audi.

Its a story deserving of a happy ending. But of course it didnt have one. Eventually, as he became ill, Hamid did accept help, and during a cold snap in February 2018 he was provided with emergency accommodation by Streets2Homes at the Oasis Hotel in Harlow. Nav Hussein, the hotel manager, checked on Hamid after receiving a concerned call over his whereabouts. When he went to his room, he saw two empty bottles of alcohol, and Hamid sitting upright on the bed. Hussein called out to him, but received no reply. He then noticed there was something different about the colour of Hamids hands and realised he was dead.

The autopsy revealed that Hamid had died of organ failure, but Protheroe is convinced he had simply lost the will to live. At the time, Hamid was on a complex cocktail of medication. I think that it had got to the point where hed just had enough, and he stopped taking his meds.

A few weeks after his death, the council arranged a funeral for Hamid. Protheroe was disappointed by the turnout. He was pleased that Hamids family were there, but wondered where they had been when his friend needed them most.

Hamid Farahi Alamdaris Facebook was last updated in November 2015. It states he started a new job as an aircraft engineer in 2006, and that he worked as an aircraft maintenance engineer for British Airways World Cargo. Most of his friends are beautiful young women from any number of countries, and a few are aviation engineers and fellow Iranians. His Facebook biography says he graduated from Bristol Aeronautical University in 1997. But there is no Bristol Aeronautical University. There is a renowned aerospace engineering department at Bristol University. However, Bristol University tells us Hamid never studied there. British Airways refuses to confirm that he worked there.

At the bottom of the list of friends is a man called Ariane F Alamdari. Ariane is Hamids nephew. Over the phone he tells us that his uncle could be a difficult man, particularly when he was drinking, but he did not believe he was a liar. Of all his personality traits, embellishing the truth or telling fibs was not one of the things that I knew him for. Ariane says the details of his uncles life are a puzzle to him. He introduces us to his father, Hamids older brother Saeed, who he says can tell us more.

Saeed is a 64-year-old academic who lectures in engineering at Bradford College and lives in Roundhay, a well-to-do suburb of Leeds. We meet in Roundhay Park, one of Europes largest city parks. Saeed is a short, slight man, who carries himself with an easy elegance. He has just completed the first half of his regular 10-mile walk around the lake. Saeed talks quietly and thoughtfully about Hamid and their parents, who came to Iran from Azerbaijan and spoke Turkish. He says that he was the lucky brother. Because he was eight years older than Hamid, he managed to leave Iran for the UK before the shah was overthrown and Ayatollah Khomeini established an Islamic republic in Iran. This was the main thing that set their lives apart, he says.

Saeed does not pretend to know every detail of his brothers life. There were so many years they were apart. Like us, he has been trying to piece together a complex jigsaw since Hamids death.

Saeed and Hamid were two of four children born into a middle-class family in Tehran. Their parents were practising Muslims and their children grew up in a secular Iran. Their father had a good, stable job working in security for the ministry of health, while their mother brought up the children. Saeed says it was obvious from early on that young Hamid was outstandingly gifted. He was good at all sorts of sports, but most of all he was academically brilliant. Both boys were drawn to the sciences, engineering and maths.

There was something else that stood out about young Hamid he loved to take risks. He and his friends used to go on to the roof of mosques and jump off them, and the curator would chase them, recalls Saeed. He liked getting chased. He wanted to be on the edge.

Life changed for everybody after the revolution of 1979. By then Saeed had already established himself in the UK. He left Tehran in 1974, studied mechanical and aerospace engineering at Leeds University, did a masters degree in combustion and settled to a life in academia. Hamid was only 16 at the time of the revolution. In 1981, when he turned 19, he was conscripted into the army to fight in the Iran-Iraq war, which had begun the previous year. Because he was such a high achiever, he was drafted in as a lieutenant.

Astrophysics was a favourite subject of his. Parallel universes. Im just hoping that in other universes, Hamid will be living a better life

Saeed shows us a photo of a fresh-faced Hamid, standing at ease in an army uniform that looks a couple of sizes too big for him. However, Saeed thinks he was anything but at ease. Here was a young man responsible for the lives of so many other men who simply didnt want to be there. He had a platoon under his control, and most of these soldiers were drafted from villages. Hamid told me that on the day they were leaving for the front, the soldiers mothers got together and told him: Were leaving our sons in your hands. And during the war he lost most of his platoon he always blamed himself for that.

Saeed says the war left Hamid with post-traumatic stress disorder. Hamid suffered a recurring nightmare that Iraqi soldiers were coming towards him with their hands raised, but he shot them anyway. After leaving the army, he went to India to study physics and to try to heal himself. Hamid told Saeed he studied for a degree, then completed a PhD. He also said he spent much of the time meditating and reading the great 13th-century Persian poets Rumi and Shams Tabrizi. I think meditating and reading were coping mechanisms for him, Saeed says. But by now Hamid also had another coping mechanism: booze.

After India, Hamid returned to Tehran, where he found himself in trouble. He could not cope with the oppressive regime or the alcohol ban. On one occasion, Hamid told Saeed, he and his friends were sentenced to 80 lashes after being caught drinking. But one of his friends had a hump on his back, and Hamid said: Youre not going to lash him. He was asked: Well, do you want to take his punishment? He said: I will, and he received 160 lashes. Thats when he came to the conclusion that this was not the place for him.

In the mid-90s, Hamid came to the UK. He was in his early 30s and lived with his sister in Croydon while doing an admin job with the charity Age UK and studying English at Croydon College. According to Saeed, he won the colleges student of the year award. From there he moved to Bristol, but Saeed says that, rather than studying at university, as suggested on his Facebook profile, Hamid attended Bristol College to get a diploma to enable him to work on planes. It was around this time that he made his application to become Stephen Hawkings assistant at the University of Cambridge. A letter dated 31 August 1997 confirms his application for the post, but there does not appear to be any correspondence about his shortlisting.

Hamid didnt get the job as Hawkings assistant, but was employed as an aeronautical engineer in Bristol. He had a stable job, lived with a girlfriend and made a decent life for himself. Saeed says these were his happiest years in Britain. But even then his brother had noticed a change. He had always been a risk-taker, but now he was becoming positively reckless. Hamid told him of a time he had gone to a drug-dealers house in Bristol to buy cannabis. He said they had machetes and everything, and all the drugs were on the table. He and his friend took everything from the table and just ran away. For a few months he had to stay low. Its not that he needed the money. He did it for the high.

In 2008 Hamid lost his job, and went on a downward spiral. He moved to the market town of Great Dunmow in Essex and stayed with a friend for a while. By now it was obvious to Saeed that his brother was addicted to alcohol and cannabis and that his life was becoming increasingly chaotic.

At one point, Saeed paid for Hamid to go to Afghanistan for an interview for a job at a US air force base. Hamid also told Saeed that he went to Saudi Arabia to be interviewed for a post in avionics. But neither of these jobs materialised. Hamid would often phone Saeed at work, asking for money. Eventually, Saeed had to give an instruction not to put Hamids calls through to him.

Saeed had his own problems. He and his wife had separated and he was looking after his son, who has Aspergers. When Hamid came to stay in Leeds, he inevitably brought trouble. There was one terrible weekend in 2011 when, within 20 minutes of Hamid arriving, there was a knock on Saeeds door. It was Hamids drug dealer. I was furious that he had arranged that. I told him, you come here whenever you want, Hamid, but no drugs. Ive a son living with me no drugs, no alcohol. The next day they were walking back to Saeeds car. He had fallen behind me, and I realised he was drinking from a bottle of whisky in a brown paper bag. His face was getting redder and redder. When he saw me looking at him, he put it in his pocket. I dragged it out and smashed it on the floor. I said: Didnt I tell you, if youre coming here, no alcohol. I had my son with me.

Saeed couldnt cope with his brothers behaviour. On the Monday, I took him to the bus station. I shook hands with him and I said: Ill see you in another world. That was the last time the brothers saw each other. Hamid would occasionally phone usually asking for money. The last time he phoned was three in the morning. His speech was slurred. I said to him: Assume you have no brother. Saeed looks out on to the lake. He says he knows he was hard on Hamid, but he felt he had to choose between his brother and his sons welfare. I have my regrets, he says. Possibly I was asking too much from him.

It was around five years later, in 2017, that Hamid sold his pension and ended up homeless. A year later he died. Hamid Farahi Alamdari physicist, spiritualist, risk-taker, addict, war veteran. He may have fought his war in a faraway country for a remote regime, but in many ways he was typical of the thousands of British war veterans who are homeless never shaking off the ghosts of the battlefield and left with lifelong PTSD. He might have told all the friends he made in that industrial park in Harlow about the beautiful and clever things in life, but ultimately it is his confessions about nightmares and the psychological scars left by war that left the strongest impression.

As for the PhD and being shortlisted for the job with Hawking, who knows? All his friends are certain of is that he had exceptional ability, that he died a disappointed man, and that they miss him. Adam Protheroe and Chrissy Sorce knew him for less than a year, but he changed their lives. Sorce says she knows she helped Hamid, but she still thinks she let him down at the end. I felt a bit bad because he messaged me a few times and I was so busy with my own family that I didnt really respond back to him as much as I should have. I did feel something towards him. He had a nice nature. I have a plant here he bought me for Christmas. I called it Hamid. Its a large succulent, is thriving and sits on her windowsill at home.

At the cafe in Harlow, Protheroe says he cant drive past Tesco these days without thinking of his friend. He was gutted when he heard of Hamids death. He mentions a book Hamid gave him as a present. Its called The Prophet. Its only a thin book, and it was just inspirational stuff live your life this way, do good, be the best person you can. It means a lot to him, he says.

Back in Leeds, Saeed admits it was a shock when he discovered Hamid had been living in a car and died homeless. He says he cant express just how grateful he is to the people of Harlow for looking after Hamid when he had given up. We were stunned by the number of books in the car, the clothes that people had given him, all the flowers at his funeral. He spends a lot of time reflecting on his brothers life, and says that these days he can remember the good times more easily. Astrophysics was a favourite subject of his. Parallel universes. He shakes his head. It was a waste of a good life. Im just hoping that in other universes, parallel universes, Hamid will be living a better life.

Saeed and his sister decided not to tell their 90-year-old mother, who still lives in Iran, about Hamids death because they thought it would break her heart. But about a week after he died, she called my sister from Iran saying: Im getting these dreams either Hamid is ill or he is dead, which is it? And then my sister said: Yes, he has passed away. Saeed says that his mother was relieved Hamid is finally at peace.

Saeed is getting ready for the second half of his walk around Roundhay Park. Sometimes he meets a man in the park who reminds him of his brother. Seven oclock in the morning hes feeding swans, and hes got a bottle of wine with him, Saeed says. There will come a time when I will strike a conversation with him. Listen, I had a brother and he went right through what youre going through now. For now, Saeed just tells him to take care of himself.

In the UK and Ireland, Samaritans can be contacted on 116 123 or by emailing jo@samaritans.org or jo@samaritans.ie. In the US, the National Suicide Prevention Lifeline is 1-800-273-8255. In Australia, the crisis support service Lifeline is 13 11 14. Other international suicide helplines can be found at befrienders.org

If you are worried about becoming homeless, contact the housing department of your local authority to fill in a homeless application. You can use the gov.uk website to find your local council

Follow Guardian Cities on Twitter, Facebook and Instagram to join the discussion, catch up on our best stories or sign up for our weekly newsletter

More:

A gifted physicist reduced to living in his car: what killed Hamid Alamdari? - The Guardian

The Universe Is Laced with Giant Structures Connecting Distant Galaxies – Asgardia Space News

Hundreds of billions of galaxies spiral, ring-shaped, looped, and others make up our universe. Sometimes, despite their differences and the vast distances between them, galaxies move together, as if an unseen force connects them

Finding such connections suggests the presence of large-scale structures, scientists say. Made of hydrogen gas and dark matter, they are the filaments, sheets, and knots that link galaxies together. En masse, they are a far-reaching network of cosmic connections.

However, we know very little about the dynamics of the structures. Scientists are eager to learn more, as the structures may change some fundamental ideas we hold about the universe.

'Thats actually the reason why everybody is always studying these large-scale structures,' Noam Libeskind, a cosmographer at the Leibniz-Institute for Astrophysics, tells Vice. 'Its a way of probing and constraining the laws of gravity and the nature of matter, dark matter, dark energy, and the universe.'

Synchronicity in spite of distances

Each galaxy is part of a gravitationally bound cluster, a local group that contains a few other galaxies. The local group is, in turn, a part of a supercluster. So, for example, the Milky Way is part of a local group that contains several dozen galaxies, and the local group is part of the Virgo supercluster, that has more than 10,000 galaxies.

The effect a galaxy may have on another on the local scale is well-understood. However, how galaxies are linked to others at distances too great to be explained by gravitation remains unknown.

A recentstudy publishedin The Astrophysical Journaldescribes 445 galaxies rotating in sync with the motions of other galaxies located at a distance of tens of millions of light years away.

'This discovery is quite new and unexpected,' says Korea Astronomy and Space Science Institutes astronomerJoon Hyeop Lee, the lead author of the study. 'I have never seen any previous report of observations or any prediction from numerical simulations exactly related to this phenomenon.'

Leeand his team looked at galaxies within 400 million light years of Earth, finding that the ones rotating toward our home planet had neighbors that were moving toward it as well. Similarly, those rotating away fromEarthhad neighbors moving away from Earth, too.

'The observed coherence must have some relationship with large-scale structures, because it is impossible that the galaxies separated by six megaparsecs [roughly 20 million light years] directly interact with each other,' Leesays.

The conclusion the team made was that there must be a slowly rotating large-scale structure to explain the synchronous rotation and movement of the galaxies.

And while the idea is new, it has been observed before: A 2014 study discovered alignment of supermassive black holes at the cores of quasars that stretch billions of light years. The discovery, published in Astronomy & Astrophysics, included observations of synchronicity by using the Very Large Telescope in Chile. Analyzing the recordings from the polarization of light from nearly 100 quasars, the research team, led by University of Liges Damien Hutsemkers, reconstructed the alignment of the black holes, finding that the rotation axes of 19 quasars were parallel, even though they had been separated by a few billion light years.

'Galaxy spin axes are known to align with large-scale structures such as cosmic filaments, but this occurs on smaller scales,' Hutsemkers says. 'However, there is currently no explanation why the axes of quasars are aligned with the axis of the large group in which they are embedded.'

Will new studies overturn old theories?

If the large-scale structures exist, then the cosmological principle one that states that the universe is basically uniform and homogeneous is false. The existence of such structures would counter that principle. Even so, Hutsemkers and his team warned that more research is needed to seriously put a dent on the long-standing belief. 'Other similar structures are needed to confirm a real anomaly,' he says.

One of the difficulties astronomers face is the limitations of the observational techniques, although future radio telescopes such as the Square Kilometer Array may help. 'As far as large-scale alignments are concerned, we are essentially waiting for more data,' Hutsemkers says. 'Such studies are statistical and a step forward would require a large amount of polarization data, not easy to gather with current instrumentation.'

Another issue is the way in which dwarf galaxies seem to align around larger host galaxies. This is a problem for the CDM model, which provides the theoretical timeline of the universe since its inception. Simulations under the model show that the satellite galaxies should be distributed randomly and yet they are not. Such neatly synced galaxies have been found to orbit the Milky Way, Andromeda, and Centaurus A, with the latest discovery published in Science in 2018.

The latter has also led scientists to admit that the CDM model has serious faults.

'At the moment, we have observed this at the three closest galaxies,' Oliver Mller, lead author of the 2018 study, says. 'Of course, you can always say that its only three, so its not statistical yet. But it shows that every time we have good data, we find it, so it could be universal.'

A 2015 study suggested a way to bring together the CDM model with the new findings, suggesting that cosmic web filaments might be guiding the synced galaxies. 'One of the great things about science is that you can have a model built with thousands of pieces of data but if one thing doesnt stick it starts to crack,' explains lead author Libeskind. 'That crack either has to be sealed or its going to bring the whole house down.'

Next-generation technology offers hope

The consensus among scientists is that more research is needed, with much of the hope placed upon the data that will come from the next-generation observatories. The synced dwarf galaxies and the alignment of galaxies across millions of light years seem to hold clues to the mysteries of the large-scale structure of the universe, of forces that we do not yet understand, or both.

'What I really like about this stuff is just that we are still at the pioneering phase,' says Mller. 'Thats super exciting.'

See original here:

The Universe Is Laced with Giant Structures Connecting Distant Galaxies - Asgardia Space News

Theres Growing Evidence That the Universe Is Connected by Giant Structures – VICE

The Milky Way, the galaxy we live in, is one of hundreds of billions of galaxies strewn across the universe. Their variety is stunning: spirals, ring galaxies shaped like star-studded loops, and ancient galaxies that outshine virtually everything else in the universe.

But despite their differences, and the mind-boggling distances between them, scientists have noticed that some galaxies move together in odd and often unexplained patterns, as if they are connected by a vast unseen force.

Galaxies within a few million light years of each other can gravitationally affect each other in predictable ways, but scientists have observed mysterious patterns between distant galaxies that transcend those local interactions.

These discoveries hint at the enigmatic influence of so-called large-scale structures which, as the name suggests, are the biggest known objects in the universe. These dim structures are made of hydrogen gas and dark matter and take the form of filaments, sheets, and knots that link galaxies in a vast network called the cosmic web. We know these structures have major implications for the evolution and movements of galaxies, but weve barely scratched the surface of the root dynamics driving them.

Scientists are eager to acquire these new details because some of these phenomena challenge the most fundamental ideas about the universe.

Thats actually the reason why everybody is always studying these large-scale structures, said Noam Libeskind, a cosmographer at the Leibniz-Institut for Astrophysics (AIP) in Germany, in a call. Its a way of probing and constraining the laws of gravity and the nature of matter, dark matter, dark energy, and the universe.

Why are distant galaxies moving in unison?

Galaxies tend to form gravitationally bound clusters that belong to even larger superclusters. Earths long-form cosmic address, for instance, would have to note that the Milky Way is part of the Local Group, a gang of several dozen galaxies. The Local Group is inside the Virgo supercluster, containing more than 1,000 galaxies.

On these more local scales, galaxies frequently mess with each others spins, shapes, and angular velocities. Sometimes, one galaxy even eats another, an event known as galactic cannibalism. But some galaxies show dynamic links across distances too great to be explained by their individual gravitational fields.

For instance, a study published in The Astrophysical Journal in October found that hundreds of galaxies were rotating in sync with the motions of galaxies that were tens of millions of light years away.

This discovery is quite new and unexpected, said lead author Joon Hyeop Lee, an astronomer at the Korea Astronomy and Space Science Institute, in an email. I have never seen any previous report of observations or any prediction from numerical simulations, exactly related to this phenomenon.

Lee and his colleagues studied 445 galaxies within 400 million light years of Earth, and noticed that many of the ones rotating in a direction toward Earth had neighbors that were moving toward Earth, while those that were rotating in the opposite direction had neighbors moving away from Earth.

The observed coherence must have some relationship with large-scale structures, because it is impossible that the galaxies separated by six megaparsecs [roughly 20 million light years] directly interact with each other, Lee said.

Lee and his colleagues suggest that the synchronized galaxies may be embedded along the same large-scale structure, which is very slowly rotating in a counter-clockwise direction. That underlying dynamic could cause the kind of coherence between the rotation of the studied galaxies and the motions of their neighbors, though he cautioned that it will take a lot more research to corroborate his teams findings and conclusions.

While this particular iteration of weirdly synced up galaxies is novel, scientists have observed odd coherences between galaxies at even more mind-boggling distances. In 2014, a team observed curious alignments of supermassive black holes at the cores of quasars, which are ancient ultra-luminous galaxies, that stretch across billions of light years.

Led by Damien Hutsemkers, an astronomer at the University of Lige in Belgium, the researchers were able to observe this eerie synchronicity by watching the universe when it was only a few billion years old, using the Very Large Telescope (VLT) in Chile. The observations recorded the polarization of light from nearly 100 quasars, which the team then used to reconstruct the geometry and alignment of the black holes at their cores. The results showed that the rotation axes of 19 quasars in this group were parallel, despite the fact that they were separated by several billion light years.

The discovery, which was published in the journal Astronomy & Astrophysics, is an indicator that large-scale structures influenced the dynamics of galaxies across vast distances in the early universe.

Galaxy spin axes are known to align with large-scale structures such as cosmic filaments but this occurs on smaller scales, Hutsemkers said in an email, noting that theoretical studies have proposed some tentative explanations of this process.

However, there is currently no explanation why the axes of quasars are aligned with the axis of the large group in which they are embedded, he noted.

The truth behind synchronized galaxies could change everything

The secret of these synchronized galaxies may pose a threat to the cosmological principle, one of the basic assumptions about the universe. This principle states that the universe is basically uniform and homogenous at extremely large scales. But the existence of correlations in quasar axes over such extreme scales would constitute a serious anomaly for the cosmological principle, as Hutsemkers and his colleagues note in their study.

However, Hutsemkers cautioned that more of these structures would need to be spotted and studied to prove that this is a serious wrinkle in the cosmological principle. Other similar structures are needed to confirm a real anomaly, he said.

For the moment, the dynamics behind these quasar positions are not well understood because there are few observational techniques to refine them. As far as large-scale alignments are concerned, we are essentially waiting for more data, Hutsemkers said. Such studies are statistical and a step forward would require a large amount of polarization data, not easy to gather with current instrumentation.

Future radio telescopes, such as the Square Kilometre Array, might be able to probe these mysterious alignments in more detail.

One of the great things about science is that you can have a model built with thousands of pieces of data but if one thing doesnt stick it starts to crack. That crack either has to be sealed or its going to bring the whole house down.

Quasar alignments are not the only hurdles that oddly synchronized galaxies have presented to established models of the universe. In fact, one of the most contentious debates in cosmology these days is centered around the unexpected way in which dwarf galaxies appear to become neatly aligned around larger host galaxies such as the Milky Way.

These satellite galaxies are currently a thorn in the side of what is known as the CDM model, which is a theoretical timeline of the universe since the Big Bang. Simulations of the universe under the CDM model predict that small satellite galaxies will end up in a swarm of random orbits around larger host galaxies.

But over the past decade, new observations have revealed that a huge chunk of the satellite galaxies around the Milky Way are synced up into one tidy orbital plane. At first, scientists wondered whether that simply meant something weird was going on with our own galaxy, but a similar plane of satellites was then observed around Andromeda.

The alarm bells really started ringing in 2015, when astronomers published observations of the same phenomenon a third time around Centaurus A, an elliptical galaxy about 10 million light years from the Milky Way.

This discovery suggests that something is wrong with standard cosmological simulations, according to a subsequent 2018 study in Science, led by Oliver Mller, an astronomer at the University of Strasbourg in France.

At the moment, we have observed this at the three closest galaxies, Mller said in a call. Of course, you can always say that its only three, so its not statistical yet. But it shows that every time we have good data, we find it, so it could be universal.

In a 2015 study, Libeskind and his colleagues suggested that filaments in the cosmic web might be guiding these organized galaxies, a process that could cohere with the CDM model. Ultimately, though, theres no conclusive answer to this dilemma yet.

One of the great things about science is that you can have a model built with thousands of pieces of data but if one thing doesnt stick it starts to crack, said Libeskind. That crack either has to be sealed or its going to bring the whole house down.

The next generation of galaxy research

This tantalizing uncertainty has motivated astronomers like Marcel Pawlowski, a Schwarzschild Fellow at AIP and co-author on the 2018 Science study, to make this problem a focus of their research. Pawlowski is looking forward to data from the next generation of huge 30-meter class observatories that could show whether other big galaxies are surrounded by either isotropic or organized patterns of satellite galaxies.

What we have to do now is expand our search to more distant satellite systems, and find satellite galaxies as well as measure their velocities, said Pawlowski in a call.

The field really advanced because of this debate going on in the literature, Pawlowski added. Its been really good to see how the observational evidence became more and more solid.

Whether its the strange motions of dwarf galaxies in our own galactic neighborhood or the eerie alignment of galaxies over millions or billions of light years, its clear that the dance moves of galaxies are an essential key to unlocking the large-scale structure of the universe.

The galaxies we see captured in static positions in beautiful deep-field shots are actually guided by many complex forces we dont yet fully comprehend, including the cosmic web that undergirds the universe.

What I really like about this stuff is just that we are still at the pioneering phase, said Mller. Thats super exciting.

Continue reading here:

Theres Growing Evidence That the Universe Is Connected by Giant Structures - VICE

Fermilab and University of Chicago scientist Josh Frieman awarded $1 million by DOE Office of Science – Fermi National Accelerator Laboratory

The Department of Energy has awarded Fermilab and University of Chicago scientist Josh Frieman $1 million over three years as part of the inaugural Office of Science Distinguished Scientist Fellowship program.

Office of Science distinguished scientist fellows were chosen from nominations submitted by nine U.S. national laboratories. Frieman is one of only five scientists selected, chosen for his scientific leadership, engagement with the academic research community, scientific excellence and significant scientific achievement.

The Distinguished Scientist Fellowship was established to develop, sustain and promote excellence in Office of Science research through collaborations between institutions of higher education and national laboratories.

Frieman says he will use the funding to support his cosmic research program and to foster tighter connections in cosmic frontier research between Fermilab and the University of Chicago.

While a significant number of University of Chicago graduate students and postdoctoral researchers have conducted research at Fermilab in a variety of areas of high-energy physics, very few currently carry out cosmology or theoretical astrophysics work at the lab.

Frieman aims to change that by building more active collaboration between Fermilab and the University of Chicago in research with cosmic surveys.

There are many very talented students at the university and many very talented scientists at Fermilab, Frieman said. Ive mentored students and postdocs at the University of Chicago, but few of them have spent time at Fermilab. And there are postdocs in the astrophysics groups at Fermilab who spend a small fraction of their time at the university. Im looking to bridge that gap, to help make the whole greater than the sum of its parts.

Friemans current research centers on the Fermilab-hosted Dark Energy Survey a project he led from 2010 to 2018 and will transition in coming years to the Large Synoptic Survey Telescope, whose construction is managed by SLAC National Accelerator Laboratory.

With its full data set accumulated, the Dark Energy Survey is at a very exciting phase of its science analysis, and both the university and Fermilab will play significant roles in LSST. Id like to get more students and postdocs engaged in both projects and to stimulate synergies between the lab and the university in the process, he said. Collaboration drives science forward, and this award recognizes that the more closely the labs and universities work together, the further we can take our research. Its an honor to be among the first recipients of this fellowship.

With a long list of leadership roles and academic distinctions to his credit, Frieman has the experience needed to bring these two research groups together. Currently the president of the Aspen Center for Physics, Frieman is a fellow of the American Physical Society, of the American Association for the Advancement of Science, and of the American Academy of Arts and Sciences. He is also chair of the American Physical Society Division of Astrophysics. He previously served on the Particle Physics Project Prioritization Panel of the High Energy Physics Advisory Panel, on the Astro 2010 Decadal Survey Committee, and on the Astronomy and Astrophysics Advisory Committee.

Frieman is head of the Fermilab Particle Physics Division and is a professor of astronomy and astrophysics and member of the Kavli Institute for Cosmological Physics at the University of Chicago.

View post:

Fermilab and University of Chicago scientist Josh Frieman awarded $1 million by DOE Office of Science - Fermi National Accelerator Laboratory

Humans Will Never Live on Another Planet, Nobel Laureate Says. Here’s Why. – Livescience.com

Here's the reality: We're messing up the Earth and any far-out ideas of colonizing another orb when we're done with our own are wishful thinking. That's according to Michel Mayor, an astrophysicist who was a co-recipient of the Nobel Prize in physics this year for discovering the first planet orbiting a sun-like star outside of our solar system.

"If we are talking about exoplanets, things should be clear: We will not migrate there," he told Agence France-Presse (AFP). He said he felt the need to "kill all the statements that say, 'OK, we will go to a livable planet if one day life is not possible on Earth.'"

All of the known exoplanets, or planets outside of our solar system, are too far away to feasibly travel to, he said. "Even in the very optimistic case of a livable planet that is not too far, say a few dozen light years, which is not a lot, it's in the neighbourhood, the time to go there is considerable," he added.

Related: 8 Ways Global Warming Is Already Changing the World

Mayor shared half of the Nobel Prize this year along with Didier Queloz for discovering the first exoplanet in October 1995. Using novel instruments at the Haute-Provence Observatory in southern France, they detected a gas giant similar to Jupiter, which they named 51 Pegasi b. (The other half of the prize was awarded to James Peebles of Princeton University for his work in dark matter and dark energy).

Since then, over 4,000 other exoplanets have been found in the Milky Way, but apparently, none of them can be feasibly reached.

Stephen Kane, a professor of planetary astrophysics at the University of California in Riverside, agrees with Mayor. "The sad reality is that, at this point in human history, all stars are effectively at a distance of infinity," Kane told Live Science. "We struggle very hard as a species to reach the Earth's moon."

We might be able to send people to Mars in the next 50 years, but "I would be very surprised if humanity made it to the orbit of Jupiter within the next few centuries," he said. Since the distance to the nearest star outside of our solar system is about 70,000 times greater than the distance to Jupiter, "all stars are effectively out of reach."

Well, you might say, plenty of things seemed out of reach until we reached them, such as sending aircraft on intercontinental flights. But "in this case, the required physics to reach the stars, if it exists, is not known to us and it would require a fundamental change in our understanding of the relationship between mass, acceleration and energy."

"So that's where we stand, firmly on the Earth, and unlikely to change for a very, very long time," he said.

Mayor told the AFP: "We must take care of our planet, it is very beautiful and still absolutely livable."

Andrew Fraknoi, emeritus chair of the astronomy department at Foothill College in California agreed that we won't be able to travel to these stars in the near future. But "I would never say we can never reach the stars and possible habitable planets," he said. "Who knows how our technology will evolve after another million years of evolution."

Originally published on Live Science.

Need more space? You can get 5 issues of our partner "All About Space" Magazine for $5 for the latest amazing news from the final frontier!

(Image credit: All About Space magazine)

The rest is here:

Humans Will Never Live on Another Planet, Nobel Laureate Says. Here's Why. - Livescience.com

Exotic ‘Fuzzy’ Dark Matter May Have Created Giant Filaments Across the Early Universe – Livescience.com

Dark matter, the mysterious substance making up a quarter of the mass and energy of the universe, might be made from extremely tiny and light particles, new research suggests. This fuzzy form of dark mattercalled that because these miniscule particles' wavelengths would be smeared out over a colossally huge areawould have altered the course of cosmic history and created long and wispy filaments instead of clumpy galaxies in the early universe, according to simulations.

The findings have observational consequences upcoming telescopes will be able to peer back to this early time period and potentially distinguish between different types of dark matter, allowing physicists to better understand its properties.

Related: 11 Unanswered Questions About Dark Matter

Dark matter is an unknown massive substance found throughout the cosmos. It gives off no light hence the name dark matter but its gravitational effects help bind together galactic clusters and cause stars at the edges of galaxies to spin faster than they otherwise would. Many scientists believe that most dark matter is cold, meaning it moves relatively slowly. But there are entirely different ideas, such as the possibility that it's tiny and fuzzy, meaning it would move quickly because its so light.

"Our simulations show that the first galaxies and stars that form look very different in a universe with fuzzy dark matter than a universe that has cold dark matter," Lachlan Lancaster, an astrophysics graduate student at Princeton University and co-author of a new paper in the journal Physical Review Letters, told Live Science.

Lancaster explained that the most common speculations about dark matter suggest it is composed of weakly interactive massive particles (WIMPs), which would have a few tens or hundreds of times the mass of a proton. Simulations that use this type of dark matter are extremely good at re-creating the large-scale structure of the universe, including vast voids of empty space surrounded by long, spidery filaments of gas and dust, a formation known as the cosmic web. But on smaller scales, such models contain a number of discrepancies from what astronomers observe with their telescopes. In this standard view, dark matter should pile up in the centers of galaxies, but nobody has seen it doing so.

Fuzzy dark matter, in contrast, would be mind-bogglingly light, perhaps a billionth of a billionth of a billionth the mass of an electron, according to a statement from MIT. Quantum mechanics states that particles can also be thought of as waves, with wavelengths inversely proportional to their mass, Lancaster said. So the wavelength of such a light particle would be thousands of light-years long.

Fuzzy dark matter would therefore have a harder time clumping together than cold, WIMP dark matter. In simulations, Lancaster and his co-authors showed that a cold dark-matter universe would have galaxies that formed relatively quickly out of spherical halos.

But fuzzy dark matter would instead coalesce into long, wispy strings of material "more giant filaments than clumpy galaxies," Lancaster said and galaxies would then be born larger and later. Dark matter would also have a harder time piling up in the centers of galaxies, potentially explaining why astronomers don't observe this clumpiness when they look at galaxies.

Instruments like the Large Synoptic Survey Telescope (LSST) in Chile and 30-meter-class telescopes being built around the world will soon be able to peer back to some of the universe's earliest days. They are expected to start taking data in the next decade, which means "we'll either start seeing the effects of fuzzy dark matter, or start ruling them out," Lancaster said.

Though other researchers have speculated about fuzzy dark matter, the new simulations do a more careful job of working out its cosmological effects, said Jeremiah Ostriker, an astrophysicist at Columbia University who was not involved in the work.

"This helps outline the details of what the formation of structure would be in this variant theory," OStriker added. "And it's one of the most interesting variant theories around."

Lancaster said his team's future simulations might focus on capturing more details of the fuzzy dark matter's effects, potentially giving astronomers a better idea of what they might expect to see through their telescopes.

Originally published on Live Science.

Need more space? You can get 5 issues of our partner "All About Space" Magazine for $5 for the latest amazing news from the final frontier!

(Image credit: All About Space magazine)

Link:

Exotic 'Fuzzy' Dark Matter May Have Created Giant Filaments Across the Early Universe - Livescience.com

How Mere Humans Manage to Comprehend the Vastness of the Universe – Scientific American

Astrophysics is not typically considered to be part of the humanities. Yet one class I took as a senior at university suggested otherwise. It left me in awe of the human mind.

With my own background rooted in the humanities, I found myself focusing on the way my professors described the cosmos. While the fantastical environments of black holes, white dwarfs and dark matter often took center stage, at the heart of each discovery was the human mind seeking to understand the unfamiliar.

Their tales of discovery made it clear that we often take our knowledge of the universe for granted. After all, the universe was not built for the human mind to understand. When we look up at the night sky, we see only a tiny fraction of what is out there. It is the task of the astrophysicist to develop a picture of the universe despite our overwhelming blindness.

I wanted to better understand how being human shapes our understanding of the universe. After talking to some of Princetons leading astrophysicists, one thing became clear: the discipline requires the human mind to be conscious not only of the universe but of itself (unless otherwise identified, all quotes are from these scientists).

Only 5 percent of the universe is normal, observable matter. Within this small fraction, the human eye can only perceive matter that emits light within a certain frequency on the electromagnetic spectrum. While birds can perceive magnetic fields and snakes can image in the infrared, we can detect only visible light. This range determines our picture of space, Adam Burrows explains. Our picture of space is, in that sense, a direct product of the human mind.

Rather than assume our picture wholly captured the universe, Jo Dunkley says that astrophysicists started wondering whether there might be other things filling our galaxies and universe that we cannot see. They designed telescopes to detect frequencies of light that lie beyond human perception, such as those of x-rays and radio waves. With these instruments, our picture of the universe became 5 percent complete.

The astrophysicists task then became one of using the visible to detect the remaining 95 percent. Einsteins laws of gravity provided a means of navigating the obscure. Because gravity depends solely upon mass, its effects can be seen irrespective of light production. As Dunkley explains, a massive, invisible object, such as a black hole, will attract a visible object, like a star.

While the Event Horizon Telescopes image of a black hole is one recent example, the strategy dates back as early as 1933. It was Swiss astronomer Fritz Zwicky who unwittingly first employed the technique when examining the behavior of galaxy clusters. He found the clusters to be far more massive than anticipated based on what was visible. He called the missing mass dark matter. Nearly 40 years later, American astronomer Vera Rubin confirmed its existence. While measuring the radial velocity of galaxies, she observed velocities incompatible with those predicted by the laws of gravity. The expectation had been that objects farther from the center of the galaxy orbited more slowly than those near the center. Rubin instead observed a constant velocity, meaning that there was no decrease at the fringe of the galaxies. In order for this to be possible within the laws of physics, there must be more to space than meets the eye, Dunkley explains. The mass existed, it just had yet to be detected.

Neta Bahcall explains that its the laws of gravity that render this dark matter indirectly observable. They allow astrophysicists to determine how much of the universe is invisible without knowing exactly what the darkness is. James Jeans once likened the situation to Platos well-known allegory, where imprisoned in our cave, with our backs to the light, we can only watch the shadows on the wall. The comparison is apt. Counterintuitively, the shadows here represent what is visible, and the light represents what we cannot see or even imagine. With this technique, dark matter came to contribute 27 percent to our cave drawing of the universe.

The 68 percent of the universe absent from our drawing is still unknown. But, in 1998, that unknown was given a name: dark energy. It emerged as a means of explaining the universes anomalous expansion. In the 1990s, astrophysicists thought that the universes rate of expansion would gradually decrease. The laws of gravity predicted that the matter filling the universe would begin to pull itself together as time went on, thus slowing the universes expansion. Yet this turned out not to be the case. The expansion was accelerating. Very little is known about dark energy, and so our picture of the universe remains far from complete.

The problems facing our picture of the universe are not limited to what we can perceive. As Ed Turner explains, our mind and the culture in which it was formed condition the way we explore the universe. Because of this particular conditioning, we have mental blind spots for the cosmic phenomena that run counter to human intuition and understanding. For instance, Turner claims that the mind is predisposed to see things as statistically significant when they might not be. We erroneously perceive patterns in the spacing of stars and of the planets in the solar system, seeing them as though they were arranged.

There are other properties of the mind that get in the way of seeing the truth, according to Turner. Consider, for instance, our belief that massive objects must take up space. It is not a direct relationship: we accept that a piece of lead is more massive than a pillow, even though the latter is larger. At the extremes, however, we expect some positive correlation between the two. The extreme physical environment of a neutron star then poses problems. As Michael Strauss suggests, the star is so dense that a thimbleful of neutron star material has the mass of 70 million elephants. We cannot help but wonder: where is all the mass?

We are blinded by being human when we look at something larger than the human experience, Robert Lupton explains. It becomes further apparent when we are confronted with counterintuitive phenomena like white dwarfs and black holes. White dwarfs decrease in size as they become more massive, says Joshua Winn, and for black holes, all mass is compressed to zero size. While we cannot see the black hole, giving the phenomena a name allows us to imagine it. The same could be said of dark matter and dark energy, explains Dunkley. As with the previous analogy, language provides a means of overcoming our initial blindness to interact with these cosmic phenomena.

Astrophysicists encounter another blinding property of the mind when considering the nature of space: we can only visualize in three dimensions. In order to imagine the geometry of space namely whether it is flat or curvedwe would need to be able to think in four dimensions, says Dunkley. For instance, to determine the curvature of a ball, we first picture the ball in three dimensions. Therefore, to determine a three-dimensional curve, the mind would need to picture the four-dimensional object.

This need arises when astrophysicists contemplate the expanding universe and relativity. For the former, the task is to conceptualize a three-dimensional universe that exists in a loopan impossible visualization, for connecting every dimension would create a four-dimensional object. For the latter, in order to explore the relativistic behavior of spacetime, the task is to imagine a three-dimensional space deformed by gravityanother impossibility.

In both cases, two-dimensional analogies facilitate understanding. Dunkley likens the universe to a piece of string attached at both ends to create a loop, and then relies upon language to bridge the-dimensional gap. We would connect every side of space, such that no matter the direction we traveled in, we would always return to our starting point, she explains. Similarly, in his 1915 paper on general relativity, Einstein used a trampoline as a two-dimensional analogue for space. He then turned to language to illustrate how placing a massive object upon the stretchy surface creates a third, vertical dimension. The same principle applied in more dimensions, he argued: massive objects bend space. While we are still unable to visualize the four-dimensional phenomena, Dunkley says that through these linguistic analogies, we can imagine the consequences.

In this manner, astrophysicists stretch the mind to see the universe from an external perspective, says Turner. Burrows speaks of retraining the brain by developing a new language better suited for the conversation between the cosmos and the individual. The environment of the universe is so different from our daily environment that often we cannot imagine it, according to Joel Hartman. Take, for instance, the size of the universe and the number of stars within it. The language of mathematics, grounded in scientific notation, logarithms and orders of magnitude, allows us to grapple with the cosmos where words fall short, explains Burrows.

Similarly, when considering the four-dimensional universe, mathematical measurements provide astrophysicists with an invaluable means of navigating the obscure. Just like in two dimensions, explains Dunkley, if the geometry of space is flat, then parallel lines, like light rays, stay parallel always. If the space is curved, then they will either come towards each other in a positively curved universe or splay apart in a negatively curved one. To return to the language of Platos cave, it seems that by measuring the shadows before us, we are able to conceptualize, in part, the nature of what remains out of sight and out of mind.

Even with this universal language of mathematics, astrophysicists still resort to biological terms to describe certain cosmic phenomena. Turner describes how astrophysicists speak of the birth and death of stars, as though they were alive. More extreme is the twin paradox devised to facilitate a correct conception of time. We are accustomed to thinking of time as strictly linear and independent, but Einsteins theory of relativity says that probably is not the case. Time passes more slowly when close to massive objects.

To overcome our intuition, astrophysicists imagine taking two twins and somehow sending one of them to spend time near a black hole, [so that] she would actually age more slowly than [her] Earth-dwelling partner, explains Dunkley. The physical manifestation of aging allows the mind to grapple with the nonuniformity of time, for we are able to envision two differently aged twins despite the semblance of a paradox.

While there are certainly properties of the mind that get in the way of seeing the truth, as Turner says, the fact that it is human allows us to engage with the universe. The lives of stars and the twin paradox are just two examples of astrophysicists making sense of the unfamiliar through our own biology. After all, it is the mind of the astrophysicist that must first identify its blind spots and then devise techniques to overcome them. In that sense, astrophysics and humanism go together in a wonderfully unexpected way. As the literary critic Leo Spitzer once wrote, the humanist believes in the power of the human mind of investigating the human mind.

So often the predominant reaction to astrophysics focuses on how vast the universe is and how insignificant a place we hold in it. It would be far better to flip the narrative to see the marvel of the mind exploring the cosmos, human lens and all.

Read more here:

How Mere Humans Manage to Comprehend the Vastness of the Universe - Scientific American

The astrophysicist whose polling aggregator is projecting the election – The Hill Times

Mired in a growing frustration with how political polls were being reported on, a Quebec astrophysicist tried his hand at aggregating polls and projecting the 2018 Quebec election. Three provincial elections later, Philippe Fournier is hoping to correctly predict 90 per cent of the winning candidates of the Oct. 21 vote.

From coast-to-coast-to-coastfrom Nunavut to Skeena-Bulkley Valley, B.C., to Avalon, N.L.338Canada dives into individual races, as the websites name suggest, across all of Canadas 338 ridings.

I was looking at some Quebec polling before the [2018] election, and I noticed that many articles in newspapers were just badly written. Some journalists are told to write about polls when they dont know much about polls and statistics, Prof. Fournier told The Hill Times in a phone interview, a little more than a week before the Oct. 21 election.

I told my students I could do much better than that, he said.

Prof. Fournier teaches astrophysics at Cgep de Saint-Laurent in Montreal, where he is currently teaching only part timeas he currently spends 70 to 80 hours per week on 338Canada.

He first became involved in polling aggregation in the Quebec provincial election in 2018, when he started writing about polling projections on his website qc125.com.

It took about three months and then La Presse in Montreal contacted me asking me questions and political parties contacted me asking me questions. So it kind of became viral, Prof. Fournier said. It went so well that after the Quebec election, I figured, well, why not do a Canada-wide system.

The distinctive feature, Paul Adams, a journalism professor at Carleton University and former EKOS pollster, said of 338Canada, is the individual riding projections.

To get insight on the individual ridings, an aggregator takes the regional and subregional polling results, and apply them to historical patterns, Prof. Adams said.

As of Oct. 15, 338Canada is projecting a close race between the Conservatives and Liberals. The Hill Times photograph by Andrew Meade

Where aggregators can miss in its projections is where there is no historical baseline.

In this election, the obvious one would be Maxime Berniers party [the Peoples Party], Prof. Adams said. We dont actually know where we would expect them to run stronger.

How the Peoples Partys 2.8 per cent national support, according to 338Canada, will be distributed in certain individual ridings remains an unknown, Prof. Adams said.

So far, Prof. Fournier has worked on three provincial elections where he correctly projected more than 90 per cent of the winning candidates over the three votes. In the 2018 Ontario election, which resulted in a Progressive Conservative government, he identified 111 of the 124 winning candidates; 11 of the 13 misses were within the margin of error. In the 2018 Quebec election, he identified 112 of 125 correct candidates; of the 13 misses, four of them were in the margin of error. His most recent projections during the 2019 Alberta provincial election were his most successful, identifying 94 per cent of the successful candidates. He projected 82 of the 87 winning politicians. Of the five that he missed, three were within the margin of error.

I dont aim for perfection because its statistics and I know its impossible, Prof. Fournier said about projecting the Oct. 21 federal vote. I have this threshold that I want to reach: 90 per cent. But 90 per cent means I will miss about 35 [ridings].

The election right now is so close that I might miss more. So it might be 85 per cent. But my desire would be 90 per cent. Above that is unrealistic, he said.

As of Oct. 14, 338Canada was projecting the Conservatives to win 135.8 seats, and the Liberals to take 134.9 seats, both with massive margins of error. As he explained in Macleans, Prof. Fournier said his model has no fewer than 139 of 338 electoral districts labeled as either toss up or leaningmeaning more than a third of all ridings remain too close to call. A week before the election, the Bloc was projected to win 32.4 seats, the NDP 30.1 seats, the Green Party at 3.8 seats, and Independents and the Peoples Party at less than one seat apiece.

Prof. Fourniers model takes into account demographics of ridings, as well as historical performance and the effect of star candidates.

Pollster Greg Lyle, president of Innovative Research, said in cases where there is a strong candidate challenging an incumbent its hard to quantify what will tip the scales.

Mr. Lyle pointed to the current campaign in Kamloops-Thompson-Cariboo, B.C., which has been held by Conservative MP Cathy McLeod since 2006. But her current Liberal challenger is Terry Lake, a former Kamloops mayor and B.C. health minister.

A lot of Conservatives have been used to voting for Terry Lake, because provincially they vote B.C. Liberal, he said. And Terry Lake was very well regarded, so he has a strong personal brand.

In that seat, would you put your finger on the scale for the Liberals if it was close, Mr. Lyle said. But once you do that, now you are not betting on the methodology anymore, youre betting on the grey area.

As of Oct. 15, 338Canada is projecting that Ms. McLeod is likely will win re-election, with Mr. Lake finishing a distant second place.

Prof. Fournier said initially some pollsters werent all receptive to his modelling.

There are amateurs online and Im sure those amateurs really grind the gears of many pollsters. I know some pollsters really dont like aggregators, he said.

When he first started Qc125.com, Prof. Fournier said pollster Jean-Marc Lger was initially not pleased with him.

[Mr. Lger said,] I didnt know you were a scientist, I thought you were just some guy on the internet pulling numbers. Like everything on the internet, there are amateurs that just do anything and there are the serious people, Prof. Fournier said.

In addition to the website, Prof. Fournier also writes about his polling aggregate projections for Lactualit and Macleans.

When looking at historical examples, Prof. Fournier takes into account the 2011 and 2015 elections.

I look further in the past for some districts, he said, but the thing is the demographics in some parts of the country, especially the urban areas changed so fast [that] they would not be very useful to use the 2004 [or] 2006 numbers.

Prof. Adams said, generally speaking, aggregators are better than individual pollsters in predicting outcomes.

Pollster Frank Graves, pictured at the Green Partys 2016 convention in Ottawa, says aggregators can have the corrosive impact on a voters decision to not cast a ballot. The Hill Times photograph by Sam Garcia

Thats not to say that in any given election, there may be an individual pollster that comes out better than the aggregations, but the problem is you cant predict in advance which pollsters that is going to be, he said. Youre safer to stick with the aggregators.

There are two key concerns that aggregation has to focus on to influence the success of the model, Prof. Adams said. Aggregators have to decide the way each individual will be weighted and when to discard old polls for the aggregation model.

For Prof. Fournier, he will weigh a poll down in his model if the results are too out of line with the overall average. But, he said, if subsequent polling shows that the poll wasnt an outlier and was a precursor, it will regain its weight.

Outside of campaigns, Prof. Fournier said he can keep a poll in the model for around two months given how slowly the numbers move. As the poll gets older, the less weight it will have in the model.

During the election, Prof. Fournier said, he will only keep a poll in the model for a week.

Prof. Adams said if a poll is kept in the model for too long, it can miss the rapidly changing mood of an electorate.

If you take a weeks worth of results, you have a larger total number of cases, like you have tens of thousands of cases potentially adding up all the different polls, in a more stable environment that would give you a better result than just one or two polls at the end of the campaign. But if theres movement at the end of the campaign then a failure to decay older polls quickly enough will not serve you as well, he said.

EKOS Research president Frank Graves said he didnt think the aggregators are adding a service that cant be done elsewhere, as many pollsters put out their own seat projections.

Over the years, Mr. Graves said EKOS has performed better than the aggregators in projecting seats. In the 2006 federal election, EKOS projected the Conservatives would win 125 seats, plus or minus five seats. In the end, the party won 124 seats.

Mr. Graves said a seat projection should be within 20 seats of the winning party.

He added that if the aggregators are inaccurate or overstating their precision, there can be a corrosive impact on the voter decision making, as some people may decide not to vote if they look at a projection and see one candidate projected to win easily.

I would not rule out the fact that the aggregators contributions in the U.S. presidential election couldve been the victory for Donald Trump because a lot of disaffected, weakly-engaged Hilary [Clinton] voters were told, This is mailed in. Its done. Dont worry. And they stayed home [on election day], Mr. Graves said.

nmoss@hilltimes.com

The Hill Times

Neil Moss is a reporter at The Hill Times covering federal politics, foreign policy, and defence.- nmoss@hilltimes.com

View original post here:

The astrophysicist whose polling aggregator is projecting the election - The Hill Times

Norwich Science Festival launches with physics and astronomy events | What’s on and things to do in Norfolk – Eastern Daily Press

PUBLISHED: 16:03 15 October 2019

Rebecca MacNaughton

Immerse yourself at Norwich Arts Centre on Tuesday October 22 and Wednesday October 23. Picture: [UNIT]

Archant

Have you ever wondered what a star looks like when it is born, how you measure the speed of light or why dogs are so important to spaceflight? Head to Norwich Science Festival, October 8-26, to get the answers.

Email this article to a friend

To send a link to this page you must be logged in.

Ever since man walked on the moon 50 years ago, we've been fascinated by space. It has populated our favourite books, films and TV shows for decades and now, with the advent of commercial space tourism, more of us might get the chance to explore it.

Head to The Forum on Friday, October 25 to find out how spaceflight has changed over the years as journalist and broadcaster, Richard Hollingham, returns to his hometown to chair a panel called The Future of Human Spaceflight: The Moon, Mars and Beyond.

He will be joined by a diverse panel of experts, including space engineering consultant and founder of Rocket Women Vinita Marwaha Madil, journalist and broadcaster Sue Nelson, medical doctor and ESA researcher Beth Healey and University of Southampton researcher Christopher Ogunlesi. Together, they will discuss how spaceflight has changed since the Apollo missions and how commercial space tourism is set to bring a wider cross-section of people to orbit - and, he says, the panel will also share some important insights on how women have shaped the course of the 21st century space race.

Richard will also return to The Forum on Saturday, October 26 for Space Dogs, an exploration of how canine cosmonauts have paved the way for human exploration. "Dogs are the great unsung heroes of space," says Richard. "Every astronaut from Yuri Gagarin to Tim Peake owes their experiences to these pioneering space dogs."

He'll detail how stray dogs from the Soviet Union paved the way for human spaceflight and look at some of the key canine cosmonauts, from Laika - the first dog sent to space in 1951 - to Belka and Strelka who, Richard says, "flew, orbited and returned to Earth to be hailed as Soviet celebrities."

If you've ever wondered how science and art can work together, then head to Norwich Puppet Theatre on Friday, October 25 from 7-8.35pm, as The Cosmic Shambles Network presents Signals, a comedy play that follows two astronomers as they hunt for alien life.

The show asks some pretty hefty questions about the search for meaning - "what if we did find aliens?" asks producer Trent Burton, "how would humanity react, how would those two individuals react?" - as well as the role of art in science.

"The Cosmic Shambles Network blurs the line between science and art - once people get over the initial idea of it, they realise it's a much more natural fit than they thought," says Trent.

The performance will also be followed by a talk from Stargazing Live's Professor Lucie Green as she unpicks some of the science behind the show. "There's some really nice science in the show so the talk afterwards will expand on that," says Trent. "It's a great juxtaposition between these two people, stuck at a desk, and what these questions, at the edge of the universe, could mean."

There will also be a night of music at The Octagon Chapel on Saturday, October 26 as The Sky at Night's Prof Chris Lintott presents The Crowd and the Cosmos before being joined by acclaimed musician Steve Pretty - expect a unique, out of this world evening as they perform a special version of their acclaimed show, Universe of Music.

DON'T MISS OUT

October 22-23

[UNIT]: [REACH THE MOON]

Norwich Arts Centre, 2-2.45pm, 6-6.45pm and 8-8.45pm

Cost: 4/6/9/12

Age: 5+

Immerse yourself in these audio/visual performances which celebrate the 50th anniversary of the first moon landing. It will be an all-encompassing audio/visual feast which innovatively marries science with art.

October 26

Radio Blips and Blasts: Pulsars and our Understanding of the Cosmos

The Forum, Millenium Plain, 3.30-4.30pm

Cost: Free

Age: 12+

Since their discovery in 1967, observations of pulsars - the incredibly dense, highly magnetic, rapidly rotating remnants of supernova explosions - have been used to increase our understanding of fundamental physics. In this talk, UEA's Dr Robert Ferdman will discuss the state of astrophysics leading up to, and including, this momentous discovery.

Introduction to the Universe: Sleep Not Essential!

The Forum, Millenium Plain, 5-6pm

Cost: 5

Age: 12+

TV astronomer and author Mark Thompson will expound the wonders of the Universe in a warm-up up to his 2020 record-breaking attempt to lecture for five days straight with no sleep! Anything could happen.

Buy tickets and find out more at http://www.norwichsciencefestival.co.uk

Read the rest here:

Norwich Science Festival launches with physics and astronomy events | What's on and things to do in Norfolk - Eastern Daily Press

What the Women of the First All Female Spacewalk Will Do at the ISS – Newsweek

Two NASA astronauts are due to make history this week by taking part in the first ever all-female spacewalk.

Astronauts Christina Koch and Jessica Meir will work to fix the power system of the International Space Station (ISS), the habitable satellite which is in orbit 220 miles above the Earth's surface.

The momentous spacewalk was due to take place on October 21. But NASA announced on Tuesday it would be pushed forward to Thursday or Friday.

In a change to their brief, the pair will replace a faulty battery charge-discharge unit, which is currently preventing a new lithium-ion battery installed earlier this month from powering the ISS.

The ISS is fuelled by a collection of thousands of solar cells known as arrays. Battery charge-discharge units control how much charge batteries which collect energy from these arrays receive.

NASA officials explained during a press conference attended by Space.com that the issue stems from a battery pack which was swapped in April.

Despite the broken unit, NASA gave assurances in a statement that the crew is safe and their laboratory experiments onboard the ISS have not been disrupted.

The postponed spacewalk due to take place on 21 October would have been the fourth of 10 planned to take place between October and December, as part of what is known as Expedition 61.

Commanded by the European Space Agency's Luca Parmitano, the mission includes NASA astronauts Koch, Meir, and Andrew Morgan, as well as Russia's Aleksandr Skvortsov and Oleg Skripochka.

Meir and Koch had originally planned to help replace nickel-hydrogen batteries with "newer, more powerful" lithium-ion batteries on the far side of the ISS's port truss, according to NASA. The work is a continuation of an upgrade of the stations power system which started in January 2017.

The second half of the sequence, expected to start in November, will see crew members fix the space station's alpha magnetic spectrometer.

Meir joined Kochwho holds the record for the longest single spaceflight by a womanat the satellite in late September, and will spend over six months on the ISS.

Read more

The first all-woman spacewalk was controversially postponed in March as there were not enough medium-sized space suits on the ISS to fit both women. NASA astronaut Anne McClain was scheduled to join Koch in updating the ISS's power sources. But McClain arrived back on Earth in June, completing a 204-day mission.

In March, McClain became the 13th woman to complete a spacewalk, followed by Koch a few days later.

McClain tweeted back in March: "This decision was based on my recommendation. Leaders must make tough calls, and I am fortunate to work with a team who trusts my judgement. We must never accept a risk that can instead be mitigated. Safety of the crew and execution of the mission come first."

Dr. Scott G. Gregory, lecturer in astrophysics at the University of Dundee, told Newsweek the all-female spacewalk is "both historic and inspirational."

"Despite many talented female scientists and engineers, spacewalks have been a male-dominated activity," he said.

"Although there have been female spacewalkers before, it has always been with a male counterpart. This first all-female spacewalk is long overdue. Jessica Meir and Christina Koch are following their childhood dreams of being astronauts and 'walking' in space. It represents years of dedication, study, hard work, and pushing limits and that is truly inspirational."

Gregory said he'll be watching the live stream of the spacewalk with his 5-year-old daughter.

"We'll be following the news as Jessica Meir and Christina Koch write their own history."

"All over the world lots of little girlsand little boyswill be watching and they'll be dreaming that they'll be walking in space when they're grown up," he added. "If that inspires them to dedicate their lives to scientific or technological endeavours, this can only be a positive for all of society."

Read the original post:

What the Women of the First All Female Spacewalk Will Do at the ISS - Newsweek

Nobel Prize in Physics: James Peebles, master of the universe, shares award – Firstpost

The ConversationOct 14, 2019 16:04:31 IST

During the press conference in which he was revealed as one of the winners of the 2019 Nobel Prize in Physics, James (Jim) Peebles was asked to point to a single discovery or breakthrough from his long career that would put the award in context. Peebles demurred, replying instead: Its a lifes work.

Thats a perfect description of his contribution to our understanding of the universe. His is a career so influential that he is widely recognised as one of the key architects of the field of physical cosmology, the study of the universes origin, structure and evolution. I am sure I am not alone in regarding Peebles as the greatest living cosmologist.

Nobel Physics Prize winner- James (Jim) Peebles. image credit: Princeton University/EPA

Peebless research career started in the early 1960s. The Canadian-born scientist earned his undergrad at the University of Manitoba and later gained his PhD in the group of Robert Dicke at Princeton University in New Jersey in 1962. He has remained there ever since. Peebles now holds the title of Albert Einstein Professor of Science at Princeton.

In the 1960s, Dickes group was working on theoretical predictions and the corresponding observational consequences for the state of the primordial universe, the phase immediately following the Big Bang lasting for a few hundred thousand years. At that time the Big Bang theory for the formation of the universe was not yet fully accepted, despite observational evidence that galaxies were moving away from each other.

Dickes group was working on the theory that if the universe was expanding, then it must have been much smaller, hotter and denser in the past. The prediction was that the thermal radiation from this epoch might be still be observable today as background radiation pervading the universe. The Princeton group was also designing instruments to try to detect it.

Meanwhile, Arno Penzias and Robert Wilson, working for Bell Labs (also in New Jersey), had detected an unusual persistent background noise in their experiment. They were investigating the use of high altitude echo balloons, a kind of early satellite communication.

When Penzias and Wilson approached Dickes group for advice, it became clear that they had actually detected the relic background radiation. We call it the cosmic microwave background (CMB) because the radiation peaks in the microwave part of the electromagnetic spectrum.

A map of the universes cosmic microwave background radiation. image credit: NASA

The resulting papers were arguably the birth of the field of observational cosmology, a branch of physics that has revolutionised our view of the cosmos and our place within it. Peebles played a pivotal role in our theoretical understanding of the primordial universe and its evolution, but he also recognised that the CMB was a treasure trove of information that could be plundered. In particular, it holds clues about the formation of cosmic structures the galaxies and indeed clues about the fundamental nature of the universe itself.

Much of Peebless work has focused on understanding the emergence and growth of structure in the universe from the relatively smooth primordial conditions encoded in the CMB. In the process he has helped define an entire field of study.

For example, in the early 1970s, he was one of the first to run computer simulations of cosmic structure formation, a practice that is an entire branch of research today, where cosmologists explore toy universes.

Peebles helped usher in the dark sector to our model of the universe, becoming a pioneer of (what is now called) the standard cosmological model. In this model, the universe is dominated by mysterious forms of matter and energy that we are yet to fully understand, but whose existence is supported by observational evidence. Normal matter now has an almost negligible cosmic relevance compared to this dark matter and dark energy.

Peebles has produced such an immense body of work it is impossible to do it all justice in this short article. In one of his most influential papers, he linked the subtle fluctuations in the temperature of the CMB which reflect ripples in the density of matter shortly after the Big Bang with the way in which matter is distributed on a large-scale throughout the present day universe. The link exists because all the structure we see around us today must have grown through the evolution of those primordial seeds.

Peebles advanced the concept of a dark matter component to the universe and its implications for the evolution of structure. Through this, and other work, he helped establish the theoretical framework for our picture of how galaxies have formed and evolved. And he demonstrated how observations of the CMB and the distribution of galaxies could be used as evidence to help measure key cosmological parameters, the numbers that feature in the equations we use to describe the nature of the universe.

The influence of Peebles doesnt end there. Aside from his monumental contributions to fundamental research, spanning the CMB, dark matter, dark energy, inflation, nucleosynthesis, structure formation and galaxy evolution, his textbooks have educated generations of cosmologists. They will do for years to come. His Principles of Physical Cosmology is on my desk right now.

In the Nobel press conference, Peebles was keen to highlight that he didnt work alone. But to say that he has been largely responsible for shaping our understanding of the universe is a cosmic understatement.

James Geach, Professor of Astrophysics and Royal Society University Research Fellow, University of Hertfordshire

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Visit link:

Nobel Prize in Physics: James Peebles, master of the universe, shares award - Firstpost

Can you pivot from studying galaxy evolution to working in data science? – Siliconrepublic.com

Brian OHalloran of Liberty IT discusses his work as a data scientist and the unusual route that led him to where he is now.

Brian OHalloran is a data scientist at Liberty IT, working on natural language programming projects and managing stakeholders. But before joining the company, he was a researcher in astrophysics and went on to work at the Daily Telegraph, among other roles.

Here, he tells Siliconrepublic.com about the world of data science, and the transferable skills that made his colourful career path possible.

Working as a data scientist is not too far removed from my academic roles. You get to do R&D, after all BRIAN OHALLORAN

Prior to joining Liberty IT, I was lead data scientist at the Daily Telegraph in London, working on things like recommendation systems for users and building election models for Westminster elections. Before that, I was in a similar role at eFinancialCareers again in London which I joined after leaving academia.

I used to be an astrophysicist. My area of interest was galaxy evolution, particularly focused on nearby dwarf galaxies as theyre excellent proxies for understanding how galaxies evolved in the early universe.

I spent four years as a postdoc in Washington DC, working on projects focused on this type of research, followed by another six in London. The latter role was as part of the European Space Agencys Herschel Space Telescope project, working on the SPIRE instrument team.

I graduated from NUI Maynooth with a BSc in experimental physics and mathematics in 1998, followed by a PhD in experimental physics from UCD in 2003.

Obviously, I picked up the hard skills for analysing, breaking down and solving problems during this time. What was invaluable though, in terms of my current role, were the soft skills that you pick up by accident and through stealth.

I spent quite a lot of time teaching physics and astronomy courses, and learned invaluable soft skills in terms of communication of ideas and people and stakeholder management, something particularly of value when dealing with C-suite and non-technical stakeholders!

Well, that depends on the problem, of course. Ive spent quite a lot of time working on natural language programming projects during my data science career. Most of my actual development time is spent knee-deep in Python, TensorFlow, Keras and Spacy.

At Liberty IT, weve migrated our DS frameworks to the cloud. Were increasingly using Amazon SageMaker and their competitor from Microsoft, and both loom large in our future.

Ive been lucky to have not just one, but a number of hugely influential people throughout both my academic and data science careers. My PhD supervisor at UCD, Brian McBreen, played a huge role in the development of my academic career.

In terms of my data science career, my bosses and colleagues at the Telegraph were greatly influential in where I am today, including Magda Piatkowska, Herv Schnegg and Dimitris Pertsinis.

In some ways, working as a data scientist is not too far removed from my academic roles. You get to do R&D, after all, and so are given a lot of leeway in that regard, which is great as it allows you to be very creative.

I really enjoy working with stakeholders, as it is very much a two-way street in terms of education and evangelising. If you do it right, you get to iron out what they are looking for as a final product, everyone gets excited and commits to the project. Stakeholder buy-in and proper communication back and forth are such crucial components of success in the data science field. Without either, projects are doomed to failure.

The data science function at Liberty IT is very new, so theres huge potential for projects across the Liberty Mutual Insurance Group, with us at the heart of that. Its a really exciting time and place to be in.

Data science functions that work well and that add real business value. If more and more firms crack that problem, its a really exciting trend. The rest, in terms of trends, is really just window dressing.

Brush up on those soft skills. Learn to network, learn how to listen to your stakeholders. Theres no point in building technically wonderful solutions if theres no customer willing to use them.

Data scientists need to stay away from ivory towers at all costs. Make sure you do too.

Read the original:

Can you pivot from studying galaxy evolution to working in data science? - Siliconrepublic.com

A Soviet Satellite Falls to Earth in ‘The Walking Dead’ Season 10. How Realistic Is It? – Space.com

AMC's "The Walking Dead" launched its 10th season last week to the delight of zombie fans everywhere, but the premiere also contained a space junk Easter egg that just might be a major plot point for the series: a Soviet satellite crashing to Earth.

The episode "Lines We Cross" ends with an old Soviet satellite crashing to Earth as a brilliant daytime fireball. It loses unmistakable sonic booms and a sparks wildfire in enemy territory (watch out for Whisperers!) that the show's heroes must battle to save their hunting grounds.

"We'd been talking the the writers' room about what are different things that happen the more time goes on," executive producer Angela Kang said in AMC's "Talking Dead" recap of the Oct. 6 premiere. "We thought that it would just be like an interesting thing that we haven't dealt with before, and then see what things they can get from the satellite in terms of technology or to help them."

Related: The Biggest Spacecraft to Fall Uncontrolled from SpaceMore: Failed 1970s Venus Probe Could Crash to Earth This Year

A Soviet satellite falls to Earth in a brilliant fireball in AMC's "The Walking Dead" Season 10 premiere "Lines We Cross,"

(Image credit: AMC)

According to Kang, "The Walking Dead" showrunners sought advice on satellites from a NASA scientists at the Jet Propulsion Laboratory in Pasadena, California.

That got us wondering how accurate the satellite crash depiction was, so we reached out to astrophysicist Jonathan McDowell at the HarvardSmithsonian Center for Astrophysics in Cambridge, Mass. who tracks satellites and space junk in Earth orbit.

Our first question: How accurate is the fireball, sonic boom and crash, which leaves much of the satellite intact?

"The visual of the reentry ... is good, although it looks too high at that point to have audible sonic booms, I would guess. Overall, not bad as a depiction," McDowell told Space.com in an email. "The almost-intact satellite found on the ground ... is not plausible."

The appearance of "The Walking Dead" satellite resembles a type of old Soviet surveillance satellite known as a Tselina-R, which was used for electronic intelligence, McDowell said.That might just be a coincidence, though.

According to Russian spaceflight expert Anatoly Zak, who runs Russianspaceweb.com, Tselina-R launched in 1990 (before the end of the Soviet Union) and was designed to last about six months. But Tselina-class satellites were launched throughout the late 1960s, 70s, 80s and 90s, with the last to fly in the early 2000s.

Next question: Is 10 years in "The Walking Dead" (that's my estimate based on the show's seasons) enough time for satellites to fall from space?

"The 10 years is enough if the satellite were in a relatively low orbit of say 500 km," McDowell said. "It'd be unlikely to have a jet-engine-size bit surviving unless it was actually designed for reentry (like a camera/film capsule)."

Some Soviet satellites like that depicted in "The Walking Dead" have had small engine parts, like a meter-sized plate or quarter-meter spherical pressure tank, survive, but nothing the size of what appears in the show, McDowell added.

"Maybe you'd get a piece that big from a space station module."

Related: Skylab's Remains: NASA Space Station Debris in Australia (Photos)

The remains of a Soviet satellite in AMC's The Walking Dead. Such a large piece of space junk from a satellite would be unlikely in reality, unless it was designed to survive reentry.

(Image credit: AMC)

Here's a follow-up: The folks in "The Walking Dead" rush to the Soviet satellite to put out a wildfire, then rush to salvage any technology they can. Wouldn't there be toxic hydrazine or other chemicals to worry about? And would anything be salvageable at all?

"It's unlikely there'd be anything usable surviving I don't think anything from Skylab survived in repairable condition for example," McDowell said. "Again, if [it were] part of a system designed for reentry, that's a different story, so you could imagine a cargo ship ([SpaceX's] Dragon, for example) that boosted its recovery module in the wrong direction and was stranded in orbit for reentry 10 years later but it wouldn't look like that."

And McDowell suggests there might be more to worry about than just toxic hydrazine, a fuel used for spacecraft thrusters.

"Theconcern with hydrazine is valid but maybe brief it would probably dissipate pretty quickly. I would certainly be hesitant about approachingthething when not wearing a protective hazmat suit," McDowell said. "There might be potentially explosive hypergolic propellant on board too. And on an old Soviet sat there might be high-explosive self destruct devices."

Okay, last question: Do you watch "The Walking Dead"?

"I'm not a big zombie fan, 'Walking Dead' is too gross for me," said McDowell, though he did enjoy the TV series "iZombie."

McDowell also enjoy another show about the dead walking the Earth, HBO's "Dead Like Me," which began with Russia's Mir space station falling to Earth and its toilet seat killing the show's lead character.

"I was a fan of 'Dead Like Me,' indeed," McDowell said, "and appreciated the (again, implausible) Mir toilet seat."

Episode 2 of "The Walking Dead" Season 10 airs tonight on AMC at 9 p.m. EDT/8 p.m. CDT.

Email Tariq Malik attmalik@space.comor follow him@tariqjmalik. Follow us@SpacedotcomandFacebook.

Need more space? You can get 5 issues of our partner "All About Space" Magazine for $5 for the latest amazing news from the final frontier!

(Image credit: All About Space magazine)

See original here:

A Soviet Satellite Falls to Earth in 'The Walking Dead' Season 10. How Realistic Is It? - Space.com

This Is The One Way The Moon Outshines Our Sun – Forbes

Typically, even the full Moon is approximately 400,000 times less bright than the Sun is, making it appear about 12-14 visual magnitudes dimmer to human eyes. While, in visible light, the Sun always outshines the Moon (due to the latter reflecting the former's light), there is one part of the spectrum where the Moon can even outshine the Sun after all.

To human eyes, the Moon is the second brightest visible object, trailing only the Sun.

As seen in X-rays against the cosmic background, the Moon's illuminated (bright) and non-illuminated portions (dark) are clearly visible in this early X-ray image taken by ROSAT. The X-rays, like almost all wavelengths of light, arise mostly from reflected emission from the Sun.

Moonlight is just reflectedlight generated from other sources;it's not self-luminous.

The size, wavelength and temperature/energy scales that correspond to various parts of the electromagnetic spectrum. You have to go to higher energies, and shorter wavelengths, to probe the smallest scales. Although the Moon reflects sunlight, the most energetic photons from the Sun normally top out at X-ray energies.

Across the whole electromagnetic spectrum, the Sun always appears much brighter than the Moon.

This 1991 photo shows the Compton Gamma-Ray Observatory being deployed in space during April 7, 1991 from the Space Shuttle Atlantis. This observatory was humanity's first space-based gamma-ray satellite, and was part of NASA's original great observatories program which included Hubble, Compton, Chandra and Spitzer.

Until, that is, we launched the Compton gamma-ray observatory, capable ofmeasuring the highest-energy radiation.

A diagram of the EGRET instrument, which was used for observing the highest-energy photons aboard the Compton Gamma-Ray Observatory. The EGRET instrument is the only one capable of measuring photons with energies between about 20 MeV up to around 30 GeV: higher energy photons than the Sun typically emits.

The Sun, in gamma-rays, is very quiet, as its emitted radiation tops out at X-ray energies.

The Sun's light across the electromagnetic spectrum is due to nuclear fusion, which primarily converts hydrogen into helium. The nuclear reactions produce neutrinos and radiation that extends from the radio all the way up into the X-ray, but gamma-rays are only produced rarely: during flaring events.

The Moon, on the other hand, emits very little light relative to the Sun, but outshines it in gamma-rays.

Between 1991 and 1994, the Moon passed into the Compton Gamma-Ray Observatory's field-of-view multiple times, where the instrument was capable of observing it. Compton detected high-energy gamma-rays from the Moon with its EGRET instrument, and the energy spectrum of the lunar gamma radiation are consistent with a model of gamma ray production by cosmic ray interactions with the lunar surface. The Moon is brighter than the (non-flaring) Sun in these high energies.

Across the full electromagnetic spectrum, only in the highest-energy gamma-rays does the Moon outshine the Sun.

A thin crescent moon, just one day after the new moon, sets in the west. The remaining disk is still illuminated by the light reflected from Earth that's then incident upon the lunar surface. The fact that the Moon always appears full in Gamma-Rays,even when just a thin crescent is illuminated by the Sun, teaches us that it isn't reflected sunlight that's causing these lunar Gamma-Rays.

This observation aloneteaches us that the Moon isn't generating its gamma-rays by reflecting sunlight.

Using data from NASA's Lunar Reconnaissance Orbiter (LRO) and its narrow angle camera (LROC), we can now construct 3D models of the surface of the Moon and simulate any potential landing sites for missions. Our current understanding teaches us that the Moon's surface is made of many heavier elements, is surrounded by practically no atmosphere at all, and has a negligible magnetic field. This combination of factors basically creates 'the perfect storm' for generating gamma-rays from high-energy nuclear recoils.

Unlike the Sun,the Moon's surface is made of mostly heavier elements, while the Sun is mostly hydrogen and helium.

The only time the Sun produces gamma-rays is during flaring events, when accelerated, high-energy protons can collide with heavier nuclei, producing an excited-state nucleus that emits gamma-rays. During quiet conditions, these fast protons will only interact with hydrogen or helium nuclei, which do not produce these gamma-rays. On the Moon's surface, however, heavy nuclei abound, and the creation of excited-state nuclei that then emit gamma-rays is ubiquitous.

When cosmic rays (high-energy particles) from throughout the Universe collide with heavy atoms, nuclearrecoil causes gamma-ray emission.

Cosmic rays produced by high-energy astrophysics sources can reach any object in the Solar System, and appear to permeate our local region of space omnidirectionally. When they collide with Earth, they strike atoms in the atmosphere, creating particle and radiation showers at the surface. When they strike the heavy elements present on the Moon's surface, they can induce a nuclear recoil/reaction that winds up producing the high-energy gamma-rays we observe.

With no atmosphere or magnetic field, and a lithosphere rich in heavy elements, cosmic rays produce gamma-rays upon impacting the Moon.

Although the Sun doesn't typically generate either gamma-rays or cosmic-rays that account for what we see on the Moon, its complex magnetic field undergoes cyclical changes on an 11-year timescale. These changes can alter the gamma-ray flux from the Moon, over time, by up to about 20%.

If we had gamma-ray eyes, the Moon would always look "full" from any perspective.

With 7 panels of ever-increasing observing time, from 2 months up through 128 months, we can see how a gamma-ray image of the Moon becomes sharper and sharper over time. This image was taken by NASA's flagship gamma-ray observatory, Fermi, in energies of 31 MeV or higher. In these high-energy gamma-rays, the Moon indeed outshines the Sun.

Continue reading here:

This Is The One Way The Moon Outshines Our Sun - Forbes

Kostic named a thermodynamic topical collection editor of Entropy journal – NIU Today

Milivoje M. Kostic, professor emeritus in theDepartment of Mechanical Engineering,and editor-in-chief of the Thermodynamics Section of Entropy journal, has been recently named as a topical collection editor of Foundations and Ubiquity of Classical Thermodynamics, after serving as a guest editor for three Entropy special issues in2013,2015 and 2018.

In 2018, Kostic also published a feature paper, Nature of Heat and Thermal Energy, and attended the16th International Heat Transfer Conference(IHTC-16) where he wasa panelist on the development of a new entransy theory. The inclusion to the panel has been influenced by Kostics publication related to theentransy concept and controversies, as well as his priorcollaboration with Chinese universities, starting withkeynote lecturesat the prestigious Tsinghua University.

Entropy is a monthly, peer-reviewed, open access, scientific journal covering research on all aspects of entropy and information theory. The journal publishes original research articles, communications, review articles, concept papers and more. Since Entropy became a mainstream, interdisciplinary journal at the end of 2015, it has diversified in several sections, which also include statistical mechanics, information theory, astrophysics and cosmology, quantum information and complexity, as well as in diverse special issues and more recently in topical collections.

Thermodynamics is a science of energy and entropy, considered by many to be among the most fundamental sciences. The phenomenological laws of thermodynamics have much wider, including philosophical, significance and implications than their simple expressions based on experimental observations they are the fundamental laws of nature. Classical thermodynamics crystallizes a diverse and complex reality to a fundamental cause-and-effect ubiquitous simplicity by its fundamental principles. That is why it is hard to understand thermodynamics the first time or the second time through.

Kostics research and scholarly interests are in fundamental laws of nature; thermodynamics and heat transfer fundamentals; the second law of thermodynamics and entropy; energy efficiency; conservation and sustainability; fluids-thermal-energy components and systems; and nanotechnology and nanofluids.

Kostic retiredfrom his regular NIU duties in 2014 to pursue his scholarly work and research.

Read more from the original source:

Kostic named a thermodynamic topical collection editor of Entropy journal - NIU Today

Some Quasars Shine With the Light of Over a Trillion Stars – Universe Today

Quasars are some of the brightest objects in the Universe. The brightest ones are so luminous they outshine a trillion stars. But why? And what does their brightness tell us about the galaxies that host them?

To try to answer that question, a group of astronomers took another look at 28 of the brightest and nearest quasars. But to understand their work, we have to back track a little, starting with supermassive black holes.

A supermassive black hole (SMBH) is a black hole with more than a million solar masses. They can be much larger than that, too; up to billions of solar masses. One of these entities resides at the center of most galaxies, excluding dwarf galaxies and the like.

Theyre the result of the gravitational collapse of a massive star, and they occupy a spheroidal chunk of space from which nothing, not even light, can escape.

The Milky Way has one of these SMBHs. Its called Sagittarius A-star (Sgr A*) and its about 2.6 million solar masses. But Sgr A* is rather sedate for a SMBH. Other SMBHs are much more active, and theyre called active galactic nuclei (AGN.)

In an AGN, the black hole is actively accreting matter, forming a torus of gas that heats up. As it does so, the gas emits electromagnetic radiation, which we can see. AGNs can emit radiation all across the electromagnetic spectrum.

There are sub-classes of AGNs, and a new study focused on one of those sub-classes called quasars. A quasar is the most powerful type of AGN, and they can shine with the light of a trillion Suns. But some of these quasars are hidden behind their own torus, which blocks our line of sight. In studies of quasars, these ones are ignored or omitted, because theyre difficult to see.

But that creates a problem, because omitting them from the population of quasars means we might be missing something. It also means that one of the central questions around quasars might not be addressed properly.

The question is really multi-pronged: are these extremely bright AGN powered by moderate accretion onto extremely massive black holes? Or are they powered by extreme accretion onto more moderate mass black holes? Or maybe something else is going on. Are they powered by a host galaxy transitioning from a star-forming galaxy to something more sedate like an elliptical galaxy? By ignoring or omitting the quasars that are difficult to see, it makes finding any answers difficult.

A team of astronomers looked at 28 AGN that were both nearby and among the most luminous. Most of them happened to be in elliptical galaxies. The only criteria for choosing them was the intense activity in their nuclei. Their radio emissions span factors of tens of thousands, and their masses also cover a wide range. The astronomers wanted to find out if these bright AGN had any other distinctive qualities which would set them apart from lower luminosity obscured AGN.

Their are some intriguing and surprising results in this study. Some of the results seem to agree with other studies, while some go against the grain.

In the conclusion of their paper, the authors summarize their findings, and it seems that for now, at least, there is no clear explanation for these most luminous of quasars that shine with the light of a trillion stars.

We find that, as a group, our sample of some of the most luminous obscured AGN in BASS/DR1 does not exhibit any distinctive properties with respect to their black hole masses, Eddington ratios, and/or stellar masses of their host galaxies.

They also point out that the host galaxies are mostly all ellipticals, a surprising find. If this finding can be corroborated by other researchers, it may lend some indirect evidence in support of the popular idea that epochs of intense SMBH growth are linked to the transformation of galaxies from (star-forming) disks to (quenched) ellipticals (i.e., through major mergers).

There are 21 researchers behind this study, at institutions including the Harvard and Smithsonian Center for Astrophysics, Tel-Aviv University, Kyoto University, JPL, the Naval Observatory, the ESO, and many others. The data for their study comes from the 70 month Swift/BAT all-sky survey, and with observations using the Keck, VLT, and Palomar observatories. The study is titled BAT AGN Spectroscopic Survey XIII. The nature of the most luminous obscured AGN in the low-redshift universe. Its published in the Monthly Notices of the Royal Astronomical Society.

Like Loading...

See original here:

Some Quasars Shine With the Light of Over a Trillion Stars - Universe Today