Daily Archives: July 18, 2017

A subreddit committed to intelligent understanding of the hypothetical moment in time when artificial intelligence progresses to the point of greater-than-human intelligence, radically changing civilization. This community studies the creation of superintelligence and predict it will happen in the near future, and that ultimately, deliberate action ought to be taken to ensure that the Singularity benefits humanity.

The technological singularity, or simply the singularity, is a hypothetical moment in time when artificial intelligence will have progressed to the point of a greater-than-human intelligence. Because the capabilities of such an intelligence may be difficult for a human to comprehend, the technological singularity is often seen as an occurrence (akin to a gravitational singularity) beyond which the future course of human history is unpredictable or even unfathomable.

The first use of the term "singularity" in this context was by mathematician John von Neumann. The term was popularized by science fiction writer Vernor Vinge, who argues that artificial intelligence, human biological enhancement, or brain-computer interfaces could be possible causes of the singularity. Futurist Ray Kurzweil predicts the singularity to occur around 2045 whereas Vinge predicts some time before 2030.

Proponents of the singularity typically postulate an "intelligence explosion", where superintelligences design successive generations of increasingly powerful minds, that might occur very quickly and might not stop until the agent's cognitive abilities greatly surpass that of any human.

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Technological Singularity r/singularity - reddit

Dr. Rafael Alves Batista is a postdoctoral research associate at the University of Oxford whose research interests are in ultra-high energy cosmic rays, gamma rays and neutrinos, cosmic magnetic fields and dark matter. He is also interested in physics and astronomy education, and the philosophy of physics.

He is currently working on the "Consolidation of Fine-Tuning" project at Oxford. Broadly speaking, fine-tuning is the idea that the laws of physics are such that small changes in fundamental constants or particle masses might render life impossible. He also works in the search for the highest energy particles in the universe, the ultra-high energy cosmic rays, and is interested in understanding the origin and evolution of magnetic fields in the universe.

Dr. David Sloan is a postdoctoral research associate and the project co-lead for the Consolidation of Fine-Tuning program in BIPAC. This project aims to bring together a broad range of approaches to issues of fine-tuning in a variety of physical settings, culminating in a general picture of how physics is fine-tuned from the big-bang to the formation of the planet Earth (and possibly beyond!)

His research is mostly focused around issues in theoretical cosmologyinflation, quantum gravity, solutions to general relativity. He is particularly interested in measures of the likelihood of inflation, anisotropic models of classical and quantum cosmologies, and loop quantum gravity.

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Rafael Alves Batista and David Sloan - Singularity Hub

The first exoplanet was spotted in 1988. Since then more than 3,000 planets have been found outside our solar system, and its thought that around 20% of Sun-like stars have an Earth-like planet in their habitable zones. We dont yet know if any of these host lifeand we dont know how life begins. But even if life does begin, would it survive?

Earth has undergone at least five mass extinctions in its history. Its long been thought that an asteroid impact ended the dinosaurs. As a species, we are rightly concerned about events that could lead to our own eliminationclimate change, nuclear war, or disease could wipe us out. So its natural to wonder what it would take to eliminate all life on a planet.

To establish a benchmark for this, weve been studying what is arguably the worlds hardiest species, the tardigrade, also known as the water bear for its appearance. Our latest research suggests these microscopic eight-legged creatures or their equivalents on other planets would be very hard to kill off on any planet that was like Earth. The only astrophysical catastrophes that could destroy them are so unlikely theres an insignificant chance of them happening. This extreme survival ability adds weight to the idea that life is hardy enough to be found on other planets less hospitable than our own.

Tardigrades are known to survive incredible conditions. Drop the temperature briefly to -272 or raise it to 150 and they go on.Increase atmospheric pressure to more than 1,000 times that at the Earths surface, or drop it to the vacuum of space and they continue. They can survive for up to 30 years without food or water. They can even withstand thousands of grays (standard doses) of radiation. (Ten grays would be a lethal dose for most humans.)

They live all over the planet but can survive far below the oceans surface, around volcanic vents at the bottom of the Mariana Trench happily oblivious to the life and death of surface-dwelling mammals. Stripping the ozone layer or upper atmosphere would expose humans to lethal radiation but, at the bottom of the ocean, the water overhead would provide shielding.

We wanted to consider what cataclysmic events might be able to finally kill off the hardy tardigrade. What would need to happen to destroy every living thing on the planet? The simplest answer is that all the planets entire oceans would have to boil. On Earth, this would require an incredible amount of energy5.6 x 1026 joules (around a million years of total human energy production at current rates). We therefore have to consider the astrophysical events that could provide such an enormous amount of energy.

There are three primary candidates that could do this: asteroid impacts, supernovae, and gamma-ray bursts. Of these, asteroids are the most familiar. Weve been hit by several over the course of Earths history. But in our solar system there are just 17 candidate objects (including dwarf planets like Pluto and Eris) large enough to provide this energyand none with orbits coinciding with that of Earth.

By looking at the rate of asteroid impacts on Earth, we can extrapolate the rate at which doomsday events like this would likely occur. This turns out to be approximately once every 1017 yearsfar longer than the life of the universe. So its very, very unlikely to ever happen.

Supernovae (massive explosions of stars) release huge amounts of energy1044 joules, which is more than enough to boil our oceans. Fortunately, the energy delivered to a planet rapidly drops off the further away it is from a supernova. So for the Earth, sterilization would require a supernova to occur within around 0.013 light-years. The nearest star apart from the Sun, Proxima Centauri, is 4.25 light years away(and is the wrong type to go supernova).

For Earth-like planets in our galaxy, the distance between stars depends on their distance from the galactic center. The central bulge is more densely populated than our neighborhood. But even closer in, given the rates at which supernovae occur, sterilization is unlikely to happen more than once in 1015 years, again far beyond the age of the universe.

Finally there are gamma-ray bursts, mysterious explosions producing enormous amounts of energy focused into jets of radiation as narrow as a couple of degrees. Analyzing these bursts as we did supernovae, we found that they could only kill off life on an Earth-like planet if their origin was within about 42 light-years and the planet lay within the beam. Again, the rate at which this would occur is sufficiently low that very few planets would ever be sterilized by a gamma-ray burst.

Given how tiny the chances are of any of these apocalyptic events actually happening, were left with the conclusion that tardigrades will survive until the Sun expands about 1 billion years from now. One final, incredibly unlikely possibility is that a passing star could kick a planet out of its orbit. But even then, volcanic vents that host some tardigrades could potentially provide heat for long enough for the planet to be captured by another star.

There are many events, both astrophysical and local, that could lead to the end of the human race. Life as a whole, however, is incredibly hardy. As we begin our search for life away from Earth, we should expect that if life had ever begun on a planet, some survivors might still be there.

This article was originally published on The Conversation. Read the original article.

Stock Media provided by Igor Zhuravlov/ Pond5

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We Worked Out What It Would Take to Wipe Out All Life on a Planet ... - Singularity Hub