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Daily Archives: November 23, 2022
Elon Musk’s Free Speech Twitter Still Censoring DDoSecrets – The Intercept
Posted: November 23, 2022 at 4:21 am
- Elon Musk's Free Speech Twitter Still Censoring DDoSecrets The Intercept
- Schiff--Russia collusion disinformation specialist--wants more censorship. KABC
- Jordan Peterson Returns To Twitter, Immediately Demands The Site Censor Anonymous Trolls Forbes
- Donald Trump and the blue-tick pricks Spiked
- View Full Coverage on Google News
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EFCC secures forfeiture of N755m, luxury assets from ex-AGF, former aide to NSA The Nation Newspaper – The Nation Newspaper
Posted: at 4:21 am
EFCC secures forfeiture of N755m, luxury assets from ex-AGF, former aide to NSA The Nation Newspaper The Nation Newspaper
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Immortality review | PC Gamer
Posted: at 4:20 am
Need to know
What is it? An immersive interactive movie where you are the editor and the film might be haunted.
Expect to pay: $20 (Also on PC Game Pass)
Developer: Sam Barlow, Half Mermaid
Publisher: Half Mermaid
Reviewed on: AMD Ryzen 5 3500U, Radeon Vega Mobile Gfx 2.10 GHz, 12 GB RAM
Multiplayer? No
Link: Steam (opens in new tab)
Where does art come from? What makes creating a film different from writing a letter or inventing the toaster? Does it come from within us, or is it, sort of, all around us, y'know? This is the realm of cultural philosophy that Immortality (rather more eloquently) delves into as you unravel its FMV-led mysteries.
Immortality is presented less as a game and more as a collectors edition Blu-Ray box set of forgotten (and fictional) French model and actor Marissa Marcel's filmography. Players begin with a question posed in the "Short History of Marissa Marcel," helpfully written by Immortality director Sam Barlow: What happened to the actor? Why has she been absent for 20 years? Why were none of her movies released? Where is she now?
Luckily, the answers may lie in the "large cache of film" Barlow and his crew serendipitously found back in 2020. "After carefully collating and scanning the footage," Barlow writes, "we have created this piece of computer software in an attempt to preserve this work and share it so that Marissa may live again in the hearts of audiences."
"The image is never a simple reality," wrote philosopher Jacques Rancire. Likewise, the images in Immortality are rarely ever just what they seem. They hide things, distort their meanings, and play with the players expectations.
Part of how Immortality hides things is through restraint. Unlike previous Barlow-helmed games, players do not have immediate or comprehensive access to the entirety of the available footage. Instead, they start with a single interview from a 60s-era late night talk show, and are expected to organically branch out from there. This is where the game's first major mechanic comes in: the match cut.
Match cuts are a commonly-used editing technique to build visual clarity for moviegoers. In Immortality, the technique is used to find similarly-composed images across different movies and other media. By pausing the scene, players can examine small aspects of it and, like a point-and-click adventure game, click on whatever they are interested in. This will teleport them to another scene with the same actor or a similar object in it. As players teleport around, they add the scenes they find to their library, and gradually, the true (or 'true') story emerges. The match cut here acts like its cinematographic counterpart by creating narrative, instead of visual, continuity for the player.
The game itself is structured like a Moviola editing machine, and combined with the match cut mechanic, the player is able to put together their own "supercut" based almost entirely on vibes. While I imagine most players will use it for its specified purpose, theres a lot of room for goofing off here. Want a montage of bowls of fruit? Go for it, why not. Some wall art catch your eye? Here's some more. It's very satisfying to go down these rabbit holes on your way to solving the mystery at the heart of the game, and the sense that you are actively participating in this created world is bolstered by the presence of excellent background music by Nainita Desai that intensifies as you jump from scene to scene.
As a note, while there are full mouse and keyboard controls built in, the devs do recommend use of a controller, which we discovered added haptic feedback when we used one in our playthrough. Additionally, players will want to scrub back and forth through scenes, as hints and insights can sometimes be found running the footage backwards.
With his previous games, Barlow has worked with established actors to create moments of intense drama and intrigue across hours of footage. What sets Immortality apart is that the fictional trilogy of movies at its core (Ambrosio, Minsky and Two of Everything, all shot over a span of 30 years in the story) are essentially real movies, around an hour each, with different writers, actors and production crews for each of them, all shot in the style of the time period they're purported to be from.
But these movies are not the sole space players get to move around in. A lot of the behind-the-scenes footage features Marissa, director John Durick (played by Hans Christopher) and an assortment of other actors and crew running through rehearsals, scouting locations, hanging out with famous time-period figures like Andy Warhol, and spending intimate time together. In these moments we see tension, we see catharsis, we see regular people trying to make art while ignoring what that attempt at creation is doing to them.
Image 1 of 8
And we see the ugly side of the film industry, as well. If this game is a critique of anything, it is a critique of auteur theory, of the way the industry chews up and spits out talented people, and above all, it is a slam against the industry's rampant and violent misogyny, past and present. While discussing this further would constitute a spoiler, do be aware that there is a list of content warnings in the menu, and it includes sexual assault and abusive relationships among them.
Immortality is a remarkable game. It picks freely from several eras of cinema to deliver a genuine exploration of what it means, and what it costs, to make great, meaningful art. The game's actors are giving the performances of their lives, both as the 'real people' they're playing and in their various in-game movie roles. The aesthetics of each movie are so true-to-life that its easy to suspend disbelief and accept the fiction that these are movies from 1968, 1970, and 1999. While initially daunted by Immortality's sweeping, sometimes-cosmic scope, I found that instead of being inscrutable it was eager to show new facets of the mystery. It wanted to be played.
Immortality may draw comparisons to films by Alfred Hitchcock or David Lynch, or even past Barlow-penned titles like Telling Lies and Her Story. That is maybe unavoidable. But as a game, it goes much further beyond anything it might be compared to. Immortality is Sam Barlow's best, most thought-provoking game so far, and a barnstorming debut for Half Mermaid.
Immortality: Price Comparison
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‘Immortality,’ the latest game from ‘Her Story’ creator Sam Barlow …
Posted: at 4:20 am
Following an Xbox Series X/S and PC release this past summer, Immortality, the latest project from Her Story creator Sam Barlow, is now available on Android and iOS via Netflix. Provided you subscribe to the streaming service, you can download the game at no additional charge and experience one of the most highly acclaimed titles of 2022.
Like Barlows past projects, Immortality is a love letter to the full-motion video games of the 90s. The game tasks you with finding out the fate of fictional actress Marissa Marcel. Youll need to piece together what happened to her by watching clips from three unreleased films and behind-the-scenes footage. Barlow recruited Allan Scott and Amelia Gray, best known for their work on Queens Gambit and Mr. Robot, to help write the story of Immortality. So if youre a sucker for a good story, this one is worth checking out.
All products recommended by Engadget are selected by our editorial team, independent of our parent company. Some of our stories include affiliate links. If you buy something through one of these links, we may earn an affiliate commission. All prices are correct at the time of publishing.
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Moon – Wikipedia
Posted: at 4:20 am
Natural satellite orbiting the Earth
The Moon is Earth's only natural satellite. It is the fifth largest satellite in the Solar System and the largest and most massive relative to its parent planet,[f] with a diameter about one-quarter that of Earth (comparable to the width of Australia).[16] The Moon is a planetary-mass object with a differentiated rocky body, making it a satellite planet under the geophysical definitions of the term and larger than all known dwarf planets of the Solar System.[17] It lacks any significant atmosphere, hydrosphere, or magnetic field. Its surface gravity is about one-sixth of Earth's at 0.1654g, with Jupiter's moon Io being the only satellite in the Solar System known to have a higher surface gravity and density.
Orbiting Earth at an average distance of 384,400km (238,900mi), or about 30 times Earth's diameter, its gravitational influence very slowly lengthens Earth's day and is the main driver of Earth's tides. The Moon's orbit around Earth has a sidereal period of 27.3 days. During each synodic period of 29.5 days, the amount of visible surface illuminated by the Sun varies from none up to 100%, resulting in lunar phases that form the basis for the months of a lunar calendar. The Moon is tidally locked to Earth, which means that the length of a full rotation of the Moon on its own axis causes its same side (the near side) to always face Earth, and the somewhat longer lunar day is the same as the synodic period. However, 59% of the total lunar surface can be seen from Earth through shifts in perspective due to libration.
The most widely accepted origin explanation posits that the Moon formed 4.51billion years ago, not long after Earth, out of the debris from a giant impact between the planet and a hypothesized Mars-sized body called Theia. It then receded to a wider orbit because of tidal interaction with the Earth. The near side of the Moon is marked by dark volcanic maria ("seas"), which fill the spaces between bright ancient crustal highlands and prominent impact craters. Most of the large impact basins and mare surfaces were in place by the end of the Imbrian period, some three billion years ago. The lunar surface is relatively non-reflective, with a reflectance just slightly brighter than that of worn asphalt. However, because it has a large angular diameter, the full moon is the brightest celestial object in the night sky. The Moon's apparent size is nearly the same as that of the Sun, allowing it to cover the Sun almost completely during a total solar eclipse.
Both the Moon's prominence in Earth's sky and its regular cycle of phases have provided cultural references and influences for human societies throughout history. Such influences can be found in language, calendar systems, art, and mythology.The first artificial object to reach the Moon was the Soviet Union's Luna 2 uncrewed spacecraft in 1959; this was followed by the first successful soft landing by Luna 9 in 1966. The only human lunar missions to date have been those of the United States' Apollo program, which landed twelve men on the surface between 1969 and 1972. These and later uncrewed missions returned lunar rocks that have been used to develop a detailed geological understanding of the Moon's origins, internal structure, and subsequent history.
The usual English proper name for Earth's natural satellite is simply Moon, with a capital M.[18][19] The noun moon is derived from Old English mna, which (like all its Germanic cognates) stems from Proto-Germanic *mnn,[20] which in turn comes from Proto-Indo-European *mnsis "month"[21] (from earlier *mnt, genitive *mneses) which may be related to the verb "measure" (of time).[22]
Occasionally, the name Luna is used in scientific writing[23] and especially in science fiction to distinguish the Earth's moon from others, while in poetry "Luna" has been used to denote personification of the Moon.[24] Cynthia is another poetic name, though rare, for the Moon personified as a goddess,[25] while Selene (literally "Moon") is the Greek goddess of the Moon.
The usual English adjective pertaining to the Moon is "lunar", derived from the Latin word for the Moon, lna. The adjective selenian ,[26] derived from the Greek word for the Moon, seln, and used to describe the Moon as a world rather than as an object in the sky, is rare,[27] while its cognate selenic was originally a rare synonym[28] but now nearly always refers to the chemical element selenium.[29] The Greek word for the Moon does however provide us with the prefix seleno-, as in selenography, the study of the physical features of the Moon, as well as the element name selenium.[30][31]
The Greek goddess of the wilderness and the hunt, Artemis, equated with the Roman Diana, one of whose symbols was the Moon and who was often regarded as the goddess of the Moon, was also called Cynthia, from her legendary birthplace on Mount Cynthus.[32] These names Luna, Cynthia and Selene are reflected in technical terms for lunar orbits such as apolune, pericynthion and selenocentric.
The astronomical symbol for the Moon is a crescent, , for example in M 'lunar mass' (also ML).
Millions of years before present
Isotope dating of lunar samples suggests the Moon formed around 50million years after the origin of the Solar System.[33][34] Historically, several formation mechanisms have been proposed,[35] but none satisfactorily explains the features of the EarthMoon system. A fission of the Moon from Earth's crust through centrifugal force[36] would require too great an initial rotation rate of Earth.[37] Gravitational capture of a pre-formed Moon[38] depends on an unfeasibly extended atmosphere of Earth to dissipate the energy of the passing Moon.[37] A co-formation of Earth and the Moon together in the primordial accretion disk does not explain the depletion of metals in the Moon.[37] None of these hypotheses can account for the high angular momentum of the EarthMoon system.[39]
The prevailing theory is that the EarthMoon system formed after a giant impact of a Mars-sized body (named Theia) with the proto-Earth. The impact blasted material into orbit about the Earth and the material accreted and formed the Moon[40][41] just beyond the Earth's Roche limit of ~2.56R.[42]
Giant impacts are thought to have been common in the early Solar System. Computer simulations of giant impacts have produced results that are consistent with the mass of the lunar core and the angular momentum of the EarthMoon system. These simulations show that most of the Moon derived from the impactor, rather than the proto-Earth.[43] However, more recent simulations suggest a larger fraction of the Moon derived from the proto-Earth.[44][45][46][47] Other bodies of the inner Solar System such as Mars and Vesta have, according to meteorites from them, very different oxygen and tungsten isotopic compositions compared to Earth. However, Earth and the Moon have nearly identical isotopic compositions. The isotopic equalization of the Earth-Moon system might be explained by the post-impact mixing of the vaporized material that formed the two,[48] although this is debated.[49]
The impact would have released enough energy to liquefy both the ejecta and the Earth's crust, forming a magma ocean. The liquefied ejecta could have then re-accreted into the EarthMoon system.[50][51] Similarly, the newly formed Moon would have had its own lunar magma ocean; its depth is estimated from about 500km (300 miles) to 1,737km (1,079 miles).[50]
While the giant-impact theory explains many lines of evidence, some questions are still unresolved, most of which involve the Moon's composition.[52][example needed]Above a high resolution threshold for simulations, a study published in 2022 finds that giant impacts can immediately place a satellite with similar mass and iron content to the Moon into orbit far outside Earth's Roche limit. Even satellites that initially pass within the Roche limit can reliably and predictably survive, by being partially stripped and then torqued onto wider, stable orbits.[53]
After the Moon's formation the Moon settled in orbit around Earth much closer than today, making both bodies appear much larger in each's sky and causing on both more frequent and stronger eclipses and tidal effects.[54]Since then, due to tidal acceleration, the Moon's orbit around Earth has become significantly larger as well as longer, tidally locking the so-called lunar near side, always facing Earth with this same side.
The post formation cooled lunar surface has been shaped by large and many small impact events, retaining a broadly cratered landscape of all ages, as well as by volcanic activity, producing the prominent lunar maria. Volcanically active until 1.2billion years ago, most of the Moon's mare basalts erupted during the Imbrian period, 3.33.7billion years ago, though some being as young as 1.2billion years[55] and some as old as 4.2billion years.[56] The causes for the eruption of mare basalts, particularly their uneven occurrence on mainly the near-side, like the lunar highlands on the far side, has been an unresolved issue due to differing explanations. One explanation suggests that large meteorites were hitting the Moon in its early history leaving large craters which then were filled with lava. Other explanations suggest processes of lunar volcanism.[57]
The Moon is a very slightly scalene ellipsoid due to tidal stretching, with its long axis displaced 30 from facing the Earth, due to gravitational anomalies from impact basins. Its shape is more elongated than current tidal forces can account for. This 'fossil bulge' indicates that the Moon solidified when it orbited at half its current distance to the Earth, and that it is now too cold for its shape to adjust to its orbit.[58]
The Moon is by size and mass the fifth largest natural satellite of the Solar System, categorizeable as one of its planetary-mass moons, making it a satellite planet under the geophysical definitions of the term.[17] It is smaller than Mercury and considerably larger than the largest dwarf planet of the Solar System, Pluto. While the minor-planet moon Charon of the Pluto-Charon system is larger relative to Pluto,[f][59] the Moon is the largest natural satellite of the Solar System relative to their primary planets.[g]
The Moon's diameter is about 3,500km, more than a quarter of Earth's, with the face of the Moon comparable to the width of Australia.[16] The whole surface area of the Moon is about 38 million square kilometers, slightly less than the area of the Americas (North and South America).
The Moon's mass is 1/81 of Earth's,[60] being the second densest among the planetary moons, and having the second highest surface gravity, after Io, at 0.1654g and an escape velocity of 2.38km/s (8600km/h; 5300mph).
The Moon is a differentiated body that was initially in hydrostatic equilibrium but has since departed from this condition.[61] It has a geochemically distinct crust, mantle, and core. The Moon has a solid iron-rich inner core with a radius possibly as small as 240 kilometres (150mi) and a fluid outer core primarily made of liquid iron with a radius of roughly 300 kilometres (190mi). Around the core is a partially molten boundary layer with a radius of about 500 kilometres (310mi).[62][63] This structure is thought to have developed through the fractional crystallization of a global magma ocean shortly after the Moon's formation 4.5billion years ago.[64]
Crystallization of this magma ocean would have created a mafic mantle from the precipitation and sinking of the minerals olivine, clinopyroxene, and orthopyroxene; after about three-quarters of the magma ocean had crystallised, lower-density plagioclase minerals could form and float into a crust atop.[65] The final liquids to crystallise would have been initially sandwiched between the crust and mantle, with a high abundance of incompatible and heat-producing elements.[1] Consistent with this perspective, geochemical mapping made from orbit suggests a crust of mostly anorthosite.[15] The Moon rock samples of the flood lavas that erupted onto the surface from partial melting in the mantle confirm the mafic mantle composition, which is more iron-rich than that of Earth.[1] The crust is on average about 50 kilometres (31mi) thick.[1]
The Moon is the second-densest satellite in the Solar System, after Io.[66] However, the inner core of the Moon is small, with a radius of about 350 kilometres (220mi) or less,[1] around 20% of the radius of the Moon. Its composition is not well understood, but is probably metallic iron alloyed with a small amount of sulfur and nickel; analyses of the Moon's time-variable rotation suggest that it is at least partly molten.[67] The pressure at the lunar core is estimated to be 5GPa (49,000atm).[68]
The Moon has an external magnetic field of less than 0.2 nanoteslas,[69] or less than one hundred thousandth that of Earth. The Moon does not currently have a global dipolar magnetic field and only has crustal magnetization likely acquired early in its history when a dynamo was still operating.[70][71] However, early in its history, 4 billion years ago, its magnetic field strength was likely close to that of Earth today.[69] This early dynamo field apparently expired by about one billion years ago, after the lunar core had completely crystallized.[69] Theoretically, some of the remnant magnetization may originate from transient magnetic fields generated during large impacts through the expansion of plasma clouds. These clouds are generated during large impacts in an ambient magnetic field. This is supported by the location of the largest crustal magnetizations situated near the antipodes of the giant impact basins.[72]
The Moon's gravitational field is not uniform. The details of the gravitational field have been measured through tracking the Doppler shift of radio signals emitted by orbiting spacecraft. The main lunar gravity features are mascons, large positive gravitational anomalies associated with some of the giant impact basins, partly caused by the dense mare basaltic lava flows that fill those basins.[73][74] The anomalies greatly influence the orbit of spacecraft about the Moon. There are some puzzles: lava flows by themselves cannot explain all of the gravitational signature, and some mascons exist that are not linked to mare volcanism.[75]
On average the Moon's surface gravity is 1.62m/s2[4] (0.1654g; 5.318ft/s2), about half of the surface gravity of Mars and about a sixth of Earth's. The surface of the Moon, having a surface pressure of 1010Pa, lacks any significant atmosphere to moderate the extreme conditions of the surface.
Ionizing radiation from cosmic rays, the Sun and the resulting neutron radiation[76] produce radiation levels on average of 1,369 microsieverts per day, which is about 2-3 times more than on the International Space Station at about 400 km above Earth in orbit,[77] 5-10 times more than during a trans-Atlantic flight,[78] 200 times more than on Earth's surface.[77] For further comparison radiation on a flight to Mars is about 1.84 millisieverts per day and on Mars 0.64 millisieverts per day.[79]
The Moon's axial tilt with respect to the ecliptic is only 1.5427,[8][80] much less than the 23.44 of Earth. Because of this small tilt, the Moon's solar illumination varies much less with season than on Earth and it allows for the existence of some peaks of eternal light at the Moon's north pole, at the rim of the crater Peary.
The surface is exposed to drastic temperature differences ranging from 140C to 171C depending on the solar irradiance.Because of the lack of atmosphere, temperatures of different areas vary particularly upon whether they are in sunlight or shadow,[81] making topographical details play a decisive role on local surface temperatures.[82]Parts of many craters, particularly the bottoms of many polar craters,[83] are permanently shadowed, these "craters of eternal darkness" have extremely low temperatures. The Lunar Reconnaissance Orbiter measured the lowest summer temperatures in craters at the southern pole at 35K (238C; 397F)[84] and just 26K (247C; 413F) close to the winter solstice in the north polar crater Hermite. This is the coldest temperature in the Solar System ever measured by a spacecraft, colder even than the surface of Pluto.[82]
These extreme conditions for example are considered making it unlikely for spacecrafts to harbor bacterial spores at the Moon longer than just one lunar orbit.[85]
The Moon has an atmosphere so tenuous as to be nearly vacuum, with a total mass of less than 10 tonnes (9.8 long tons; 11 short tons).[90] The surface pressure of this small mass is around 3 1015atm (0.3nPa); it varies with the lunar day. Its sources include outgassing and sputtering, a product of the bombardment of lunar soil by solar wind ions.[15][91] Elements that have been detected include sodium and potassium, produced by sputtering (also found in the atmospheres of Mercury and Io); helium-4 and neon[92] from the solar wind; and argon-40, radon-222, and polonium-210, outgassed after their creation by radioactive decay within the crust and mantle.[93][94] The absence of such neutral species (atoms or molecules) as oxygen, nitrogen, carbon, hydrogen and magnesium, which are present in the regolith, is not understood.[93] Water vapor has been detected by Chandrayaan-1 and found to vary with latitude, with a maximum at ~6070degrees; it is possibly generated from the sublimation of water ice in the regolith.[95] These gases either return into the regolith because of the Moon's gravity or are lost to space, either through solar radiation pressure or, if they are ionized, by being swept away by the solar wind's magnetic field.[93]
Studies of Moon magma samples retrieved by the Apollo missions demonstrate that the Moon had once possessed a relatively thick atmosphere for a period of 70 million years between 3 and 4 billion years ago. This atmosphere, sourced from gases ejected from lunar volcanic eruptions, was twice the thickness of that of present-day Mars. The ancient lunar atmosphere was eventually stripped away by solar winds and dissipated into space.[96]
A permanent Moon dust cloud exists around the Moon, generated by small particles from comets. Estimates are 5 tons of comet particles strike the Moon's surface every 24 hours, resulting in the ejection of dust particles. The dust stays above the Moon approximately 10 minutes, taking 5 minutes to rise, and 5 minutes to fall. On average, 120 kilograms of dust are present above the Moon, rising up to 100 kilometers above the surface. Dust counts made by LADEE's Lunar Dust EXperiment (LDEX) found particle counts peaked during the Geminid, Quadrantid, Northern Taurid, and Omicron Centaurid meteor showers, when the Earth, and Moon pass through comet debris. The lunar dust cloud is asymmetric, being more dense near the boundary between the Moon's dayside and nightside.[97][98]
The topography of the Moon has been measured with laser altimetry and stereo image analysis.[99] Its most extensive topographic feature is the giant far-side South PoleAitken basin, some 2,240km (1,390mi) in diameter, the largest crater on the Moon and the second-largest confirmed impact crater in the Solar System.[100][101] At 13km (8.1mi) deep, its floor is the lowest point on the surface of the Moon.[100][102] The highest elevations of the Moon's surface are located directly to the northeast, which might have been thickened by the oblique formation impact of the South PoleAitken basin.[103] Other large impact basins such as Imbrium, Serenitatis, Crisium, Smythii, and Orientale possess regionally low elevations and elevated rims.[100] The far side of the lunar surface is on average about 1.9km (1.2mi) higher than that of the near side.[1]
The discovery of fault scarp cliffs suggest that the Moon has shrunk by about 90 metres (300ft) within the past billion years.[104] Similar shrinkage features exist on Mercury. Mare Frigoris, a basin near the north pole long assumed to be geologically dead, has cracked and shifted. Since the Moon doesn't have tectonic plates, its tectonic activity is slow and cracks develop as it loses heat.[105]
The main features visible from Earth by the naked eye are dark and relatively featureless lunar plains called maria (singular mare; Latin for "seas", as they were once believed to be filled with water)[106] are vast solidified pools of ancient basaltic lava. Although similar to terrestrial basalts, lunar basalts have more iron and no minerals altered by water.[107] The majority of these lava deposits erupted or flowed into the depressions associated with impact basins. Several geologic provinces containing shield volcanoes and volcanic domes are found within the near side "maria".[108]
Almost all maria are on the near side of the Moon, and cover 31% of the surface of the near side[60] compared with 2% of the far side.[109] This is likely due to a concentration of heat-producing elements under the crust on the near side, which would have caused the underlying mantle to heat up, partially melt, rise to the surface and erupt.[65][110][111] Most of the Moon's mare basalts erupted during the Imbrian period, 3.33.7billion years ago, though some being as young as 1.2billion years[55] and as old as 4.2billion years.[56]
In 2006, a study of Ina, a tiny depression in Lacus Felicitatis, found jagged, relatively dust-free features that, because of the lack of erosion by infalling debris, appeared to be only 2 million years old.[112] Moonquakes and releases of gas indicate continued lunar activity.[112] Evidence of recent lunar volcanism has been identified at 70 irregular mare patches, some less than 50 million years old. This raises the possibility of a much warmer lunar mantle than previously believed, at least on the near side where the deep crust is substantially warmer because of the greater concentration of radioactive elements.[113][114][115][116] Evidence has been found for 210 million years old basaltic volcanism within the crater Lowell,[117][118] inside the Orientale basin. Some combination of an initially hotter mantle and local enrichment of heat-producing elements in the mantle could be responsible for prolonged activities on the far side in the Orientale basin.[119][120]
The lighter-colored regions of the Moon are called terrae, or more commonly highlands, because they are higher than most maria. They have been radiometrically dated to having formed 4.4billion years ago, and may represent plagioclase cumulates of the lunar magma ocean.[56][55] In contrast to Earth, no major lunar mountains are believed to have formed as a result of tectonic events.[121]
The concentration of maria on the near side likely reflects the substantially thicker crust of the highlands of the Far Side, which may have formed in a slow-velocity impact of a second moon of Earth a few tens of millions of years after the Moon's formation.[122][123] Alternatively, it may be a consequence of asymmetrical tidal heating when the Moon was much closer to the Earth.[124]
A major geologic process that has affected the Moon's surface is impact cratering,[125] with craters formed when asteroids and comets collide with the lunar surface. There are estimated to be roughly 300,000 craters wider than 1km (0.6mi) on the Moon's near side.[126] The lunar geologic timescale is based on the most prominent impact events, including Nectaris, Imbrium, and Orientale; structures characterized by multiple rings of uplifted material, between hundreds and thousands of kilometers in diameter and associated with a broad apron of ejecta deposits that form a regional stratigraphic horizon.[127] The lack of an atmosphere, weather, and recent geological processes mean that many of these craters are well-preserved. Although only a few multi-ring basins have been definitively dated, they are useful for assigning relative ages. Because impact craters accumulate at a nearly constant rate, counting the number of craters per unit area can be used to estimate the age of the surface.[127] The radiometric ages of impact-melted rocks collected during the Apollo missions cluster between 3.8 and 4.1billion years old: this has been used to propose a Late Heavy Bombardment period of increased impacts.[128]
High-resolution images from the Lunar Reconnaissance Orbiter in the 2010s show a contemporary crater-production rate significantly higher than was previously estimated. A secondary cratering process caused by distal ejecta is thought to churn the top two centimeters of regolith on a timescale of 81,000 years.[129][130] This rate is 100 times faster than the rate computed from models based solely on direct micrometeorite impacts.[131]
Lunar swirls are enigmatic features found across the Moon's surface. They are characterized by a high albedo, appear optically immature (i.e. the optical characteristics of a relatively young regolith), and often have a sinuous shape. Their shape is often accentuated by low albedo regions that wind between the bright swirls. They are located in places with enhanced surface magnetic fields and many are located at the antipodal point of major impacts. Well known swirls include the Reiner Gamma feature and Mare Ingenii. They are hypothesized to be areas that have been partially shielded from the solar wind, resulting in slower space weathering.[132]
Blanketed on top of the Moon's crust is a highly comminuted (broken into ever smaller particles) and impact gardened mostly gray surface layer called regolith, formed by impact processes. The finer regolith, the lunar soil of silicon dioxide glass, has a texture resembling snow and a scent resembling spent gunpowder.[133] The regolith of older surfaces is generally thicker than for younger surfaces: it varies in thickness from 1015m (3349ft) in the highlands and 45m (1316ft) in the maria.[134]
Beneath the finely comminuted regolith layer is the megaregolith, a layer of highly fractured bedrock many kilometers thick.[135]
Liquid water cannot persist on the lunar surface. When exposed to solar radiation, water quickly decomposes through a process known as photodissociation and is lost to space. However, since the 1960s, scientists have hypothesized that water ice may be deposited by impacting comets or possibly produced by the reaction of oxygen-rich lunar rocks, and hydrogen from solar wind, leaving traces of water which could possibly persist in cold, permanently shadowed craters at either pole on the Moon.[136][137] Computer simulations suggest that up to 14,000km2 (5,400sqmi) of the surface may be in permanent shadow.[83] The presence of usable quantities of water on the Moon is an important factor in rendering lunar habitation as a cost-effective plan; the alternative of transporting water from Earth would be prohibitively expensive.[138]
In years since, signatures of water have been found to exist on the lunar surface.[139] In 1994, the bistatic radar experiment located on the Clementine spacecraft, indicated the existence of small, frozen pockets of water close to the surface. However, later radar observations by Arecibo, suggest these findings may rather be rocks ejected from young impact craters.[140] In 1998, the neutron spectrometer on the Lunar Prospector spacecraft showed that high concentrations of hydrogen are present in the first meter of depth in the regolith near the polar regions.[141] Volcanic lava beads, brought back to Earth aboard Apollo 15, showed small amounts of water in their interior.[142]
The 2008 Chandrayaan-1 spacecraft has since confirmed the existence of surface water ice, using the on-board Moon Mineralogy Mapper. The spectrometer observed absorption lines common to hydroxyl, in reflected sunlight, providing evidence of large quantities of water ice, on the lunar surface. The spacecraft showed that concentrations may possibly be as high as 1,000ppm.[143] Using the mapper's reflectance spectra, indirect lighting of areas in shadow confirmed water ice within 20 latitude of both poles in 2018.[144] In 2009, LCROSS sent a 2,300kg (5,100lb) impactor into a permanently shadowed polar crater, and detected at least 100kg (220lb) of water in a plume of ejected material.[145][146] Another examination of the LCROSS data showed the amount of detected water to be closer to 15512kg (34226lb).[147]
In May 2011, 6151410 ppm water in melt inclusions in lunar sample 74220 was reported,[148] the famous high-titanium "orange glass soil" of volcanic origin collected during the Apollo 17 mission in 1972. The inclusions were formed during explosive eruptions on the Moon approximately 3.7 billion years ago. This concentration is comparable with that of magma in Earth's upper mantle. Although of considerable selenological interest, this insight does not mean that water is easily available since the sample originated many kilometers below the surface, and the inclusions are so difficult to access that it took 39 years to find them with a state-of-the-art ion microprobe instrument.
Analysis of the findings of the Moon Mineralogy Mapper (M3) revealed in August 2018 for the first time "definitive evidence" for water-ice on the lunar surface.[149][150] The data revealed the distinct reflective signatures of water-ice, as opposed to dust and other reflective substances.[151] The ice deposits were found on the North and South poles, although it is more abundant in the South, where water is trapped in permanently shadowed craters and crevices, allowing it to persist as ice on the surface since they are shielded from the sun.[149][151]
In October 2020, astronomers reported detecting molecular water on the sunlit surface of the Moon by several independent spacecraft, including the Stratospheric Observatory for Infrared Astronomy (SOFIA).[152][153][154][155]
The Earth and the Moon form the Earth-Moon satellite system with a shared center of mass, or barycentre. This barycentre stays located at all times 1,700km (1,100mi) (about a quarter of Earth's radius) beneath the Earth's surface, making the Moon seemingly orbit the Earth.
The orbital eccentricity, giving ovalness of the orbit, is 0.055.[1]The Lunar distance, or the semi-major axis of the geocentric lunar orbit, is approximately 400,000km, which is a quarter of a million miles or 1.28 light-seconds, and a unit of measure in astronomy. This is not to be confused with the instantaneous EarthMoon distance, or distance to the Moon, the momentanous distance from the center of Earth to the center of the Moon.
The Moon makes a complete orbit around Earth with respect to the fixed stars, its sidereal period, about once every 27.3days,[h]. However, because the Earth-Moon system moves at the same time in its orbit around the Sun, it takes slightly longer, 29.5days;[i],[60] to return at the same lunar phase, completing a full cycle, as seen from Earth. This synodic period or synodic month is commonly known as the lunar month and is equal to the length of the solar day on the Moon.[156]
Due to tidal locking, the Moon has a 1:1 spinorbit resonance. This rotationorbit ratio makes the Moon's orbital periods around Earth equal to its corresponding rotation periods. This is the reason for only one side of the Moon, its so-called near side, being visible from Earth. That said, while the movement of the Moon is in resonance, it still is not without nuances such as libration, resulting in slightly changing perspectives, making over time and location on Earth about 59% of the Moon's surface visible from Earth.[157]
Unlike most satellites of other planets, the Moon's orbital plane is closer to the ecliptic plane than to the planet's equatorial plane. The Moon's orbit is subtly perturbed by the Sun and Earth in many small, complex and interacting ways. For example, the plane of the Moon's orbit gradually rotates once every 18.61years,[158] which affects other aspects of lunar motion. These follow-on effects are mathematically described by Cassini's laws.[159]
The gravitational attraction that Earth and the Moon (as well as the Sun) exert on each other manifests in a slightly greater attraction on the sides of closest to each other, resulting in tidal forces. Ocean tides are the most widely experienced result of this, but tidal forces considerably affect also other mechanics of Earth, as well as the Moon and their system.
The lunar solid crust experiences tides of around 10cm (4in) amplitude over 27days, with three components: a fixed one due to Earth, because they are in synchronous rotation, a variable tide due to orbital eccentricity and inclination, and a small varying component from the Sun.[160] The Earth-induced variable component arises from changing distance and libration, a result of the Moon's orbital eccentricity and inclination (if the Moon's orbit were perfectly circular and un-inclined, there would only be solar tides).[160] According to recent research, scientists suggest that the Moon's influence on the Earth may contribute to maintaining Earth's magnetic field.[161]
The cumulative effects of stress built up by these tidal forces produces moonquakes. Moonquakes are much less common and weaker than are earthquakes, although moonquakes can last for up to an hour significantly longer than terrestrial quakes because of scattering of the seismic vibrations in the dry fragmented upper crust. The existence of moonquakes was an unexpected discovery from seismometers placed on the Moon by Apollo astronauts from 1969 through 1972.[162]
The most commonly known effect of tidal forces are elevated sea levels called ocean tides.[163] While the Moon exerts most of the tidal forces, the Sun also exerts tidal forces and therefore contributes to the tides as much as 40% of the Moon's tidal force; producing in interplay the spring and neap tides.[163]
The tides are two bulges in the Earth's oceans, one on the side facing the Moon and the other on the side opposite. As the Earth rotates on its axis, one of the ocean bulges (high tide) is held in place "under" the Moon, while another such tide is opposite. As a result, there are two high tides, and two low tides in about 24 hours.[163] Since the Moon is orbiting the Earth in the same direction of the Earth's rotation, the high tides occur about every 12 hours and 25 minutes; the 25 minutes is due to the Moon's time to orbit the Earth.
If the Earth were a water world (one with no continents) it would produce a tide of only one meter, and that tide would be very predictable, but the ocean tides are greatly modified by other effects:
As a result, the timing of the tides at most points on the Earth is a product of observations that are explained, incidentally, by theory.
Delays in the tidal peaks of both ocean and solid-body tides cause torque in opposition to the Earth's rotation. This "drains" angular momentum and rotational kinetic energy from Earth's rotation, slowing the Earth's rotation.[163][160] That angular momentum, lost from the Earth, is transferred to the Moon in a process known as tidal acceleration, which lifts the Moon into a higher orbit while lowering orbital speed around the Earth.
Thus the distance between Earth and Moon is increasing, and the Earth's rotation is slowing in reaction.[160] Measurements from laser reflectors left during the Apollo missions (lunar ranging experiments) have found that the Moon's distance increases by 38mm (1.5in) per year (roughly the rate at which human fingernails grow).[165][166][167]Atomic clocks show that Earth's day lengthens by about 17microseconds every year,[168][169][170] slowly increasing the rate at which UTC is adjusted by leap seconds.
This tidal drag makes the rotation of Earth and the orbital period of the Moon very slowly match. This matching first results in tidally locking the lighter body of the orbital system, as already the case with the Moon. Eventually, after 50 billion years,[171] also the Earth would be made to always face the Moon with the same side. This would complete the mutual tidal locking of Earth and the Moon, matching the length of Earth's day to the then also significantly increased lunar month and the Moon's day, and suspending the Moon over one meridian (comparable to the Pluto-Charon system). However, the Sun will become a red giant engulfing the Earth-Moon system long before the latter occurs.[172][173]
The tidally locked synchronous rotation of the Moon as it orbits the Earth results in it always keeping nearly the same face turned towards the planet. The side of the Moon that faces Earth is called the near side, and the opposite the far side. The far side is often inaccurately called the "dark side", but it is in fact illuminated as often as the near side: once every 29.5 Earth days. During dark moon to new moon, the near side is dark.[174]
The Moon originally rotated at a faster rate, but early in its history its rotation slowed and became tidally locked in this orientation as a result of frictional effects associated with tidal deformations caused by Earth.[175] With time, the energy of rotation of the Moon on its axis was dissipated as heat, until there was no rotation of the Moon relative to Earth. In 2016, planetary scientists using data collected on the 1998-99 NASA Lunar Prospector mission, found two hydrogen-rich areas (most likely former water ice) on opposite sides of the Moon. It is speculated that these patches were the poles of the Moon billions of years ago before it was tidally locked to Earth.[176]
The Moon's highest altitude at culmination varies by its lunar phase, or more correctly its orbital position, and time of the year, or more correctly the position of the Earth's axis. The full moon is highest in the sky during winter and lowest during summer (for each hemisphere respectively), with its altitude changing towards dark moon to the opposite.
At the North and South Poles the Moon is 24 hours above the horizon for two weeks every tropical month (about 27.3 days), comparable to the polar day of the tropical year. Zooplankton in the Arctic use moonlight when the Sun is below the horizon for months on end.[177]
The apparent orientation of the Moon depends on its position in the sky and the hemisphere of the Earth from which it is being viewed. In the northern hemisphere it is seen upside down compared to the view in the southern hemisphere.[178] Sometimes the "horns" of a crescent moon appear to be pointing more upwards than sideways. This phenomenon is called a wet moon and occurs more frequently in the tropics.[179]
The distance between the Moon and Earth varies from around 356,400km (221,500mi) to 406,700km (252,700mi) at perigee (closest) and apogee (farthest), respectively, making the Moon's apparent size fluctuate. On sverage the Moon's angular diameter is about 0.52 (on average) in the sky, roughly the same apparent size as the Sun (see Eclipses). Additionally when close to the horizon a purely psychological effect, known as the Moon illusion, makes the Moon appear larger.[180]
Despite the Moon's tidal locking, the effect of libration makes about 59% of the Moon's surface visible from Earth over the course of one month.[157][60]
The Moon has an exceptionally low albedo, giving it a reflectance that is slightly brighter than that of worn asphalt. Despite this, it is the brightest object in the sky after the Sun.[60][j] This is due partly to the brightness enhancement of the opposition surge; the Moon at quarter phase is only one-tenth as bright, rather than half as bright, as at full moon.[181] Additionally, color constancy in the visual system recalibrates the relations between the colors of an object and its surroundings, and because the surrounding sky is comparatively dark, the sunlit Moon is perceived as a bright object. The edges of the full moon seem as bright as the center, without limb darkening, because of the reflective properties of lunar soil, which retroreflects light more towards the Sun than in other directions. The Moon's color depends on the light the Moon reflects, which in turn depends on the Moon's surface and its features, having for example large darker regions. In general the lunar surface reflects a brown-tinged gray light.[182]
Viewed from Earth the air filters the reflected light, at times giving it a red colour depending on the angle of the Moon in the sky and thickness of the atmosphere, or a blue tinge depending on the particles in the air,[182] as in cases of volcanic particles.[183] The terms blood moon and blue moon do not necessarily refer to circumstances of red or blue moonlight, but are rather particular cultural references such as particular full moons of a year.
There has been historical controversy over whether observed features on the Moon's surface change over time. Today, many of these claims are thought to be illusory, resulting from observation under different lighting conditions, poor astronomical seeing, or inadequate drawings. However, outgassing does occasionally occur and could be responsible for a minor percentage of the reported lunar transient phenomena. Recently, it has been suggested that a roughly 3km (1.9mi) diameter region of the lunar surface was modified by a gas release event about a million years ago.[184][185]
Half of the Moon's surface is always illuminated by the Sun (except during a lunar eclipse). Earth also reflects light onto the Moon, observable at times as Earthlight when it is again reflected back to Earth from areas of the near side of the Moon that are not illuminated by the Sun.
With the different positions of the Moon, different areas of it are illuminated by the Sun. This illumination of different lunar areas, as viewed from Earth, produces the different lunar phases during the synodic month. A phase is equal to the area of the visible lunar sphere that is illuminated by the Sun. This area or degree of illumination is given by ( 1 cos e ) / 2 = sin 2 ( e / 2 ) {displaystyle (1-cos e)/2=sin ^{2}(e/2)} , where e {displaystyle e} is the elongation (i.e., the angle between Moon, the observer on Earth, and the Sun).
On 14 November 2016, the Moon was at full phase closer to Earth than it had been since 1948. It was 14% closer and larger than its farthest position in apogee.[187] This closest point coincided within an hour of a full moon, and it was 30% more luminous than when at its greatest distance because of its increased apparent diameter, which made it a particularly notable example of a "supermoon".[188][189][190]
At lower levels, the human perception of reduced brightness as a percentage is provided by the following formula:[191][192]
When the actual reduction is 1.00 / 1.30, or about 0.770, the perceived reduction is about 0.877, or 1.00 / 1.14. This gives a maximum perceived increase of 14% between apogee and perigee moons of the same phase.[193]
Eclipses only occur when the Sun, Earth, and Moon are all in a straight line (termed "syzygy"). Solar eclipses occur at new moon, when the Moon is between the Sun and Earth. In contrast, lunar eclipses occur at full moon, when Earth is between the Sun and Moon. The apparent size of the Moon is roughly the same as that of the Sun, with both being viewed at close to one-half a degree wide. The Sun is much larger than the Moon but it is the vastly greater distance that gives it the same apparent size as the much closer and much smaller Moon from the perspective of Earth. The variations in apparent size, due to the non-circular orbits, are nearly the same as well, though occurring in different cycles. This makes possible both total (with the Moon appearing larger than the Sun) and annular (with the Moon appearing smaller than the Sun) solar eclipses.[194] In a total eclipse, the Moon completely covers the disc of the Sun and the solar corona becomes visible to the naked eye. Because the distance between the Moon and Earth is very slowly increasing over time,[163] the angular diameter of the Moon is decreasing. As it evolves toward becoming a red giant, the size of the Sun, and its apparent diameter in the sky, are slowly increasing.[k] The combination of these two changes means that hundreds of millions of years ago, the Moon would always completely cover the Sun on solar eclipses, and no annular eclipses were possible. Likewise, hundreds of millions of years in the future, the Moon will no longer cover the Sun completely, and total solar eclipses will not occur.[195]
Because the Moon's orbit around Earth is inclined by about 5.145 (5 9') to the orbit of Earth around the Sun, eclipses do not occur at every full and new moon. For an eclipse to occur, the Moon must be near the intersection of the two orbital planes.[196] The periodicity and recurrence of eclipses of the Sun by the Moon, and of the Moon by Earth, is described by the saros, which has a period of approximately 18years.[197]
Because the Moon continuously blocks the view of a half-degree-wide circular area of the sky,[l][198] the related phenomenon of occultation occurs when a bright star or planet passes behind the Moon and is occulted: hidden from view. In this way, a solar eclipse is an occultation of the Sun. Because the Moon is comparatively close to Earth, occultations of individual stars are not visible everywhere on the planet, nor at the same time. Because of the precession of the lunar orbit, each year different stars are occulted.[199]
It is believed by some that 2030,000 year old tally sticks, were used to observe the phases of the Moon, keeping time using the waxing and waning of the Moon's phases.[200]One of the earliest-discovered possible depictions of the Moon is a 5000-year-old rock carving Orthostat 47 at Knowth, Ireland.[201][202]
The ancient Greek philosopher Anaxagoras (d.428 BC) reasoned that the Sun and Moon were both giant spherical rocks, and that the latter reflected the light of the former.[203][204]:227 Elsewhere in the 5th century BC to 4th century BC, Babylonian astronomers had recorded the 18-year Saros cycle of lunar eclipses,[205] and Indian astronomers had described the Moon's monthly elongation.[206] The Chinese astronomer Shi Shen (fl. 4th century BC) gave instructions for predicting solar and lunar eclipses.[204]:411
In Aristotle's (384322BC) description of the universe, the Moon marked the boundary between the spheres of the mutable elements (earth, water, air and fire), and the imperishable stars of aether, an influential philosophy that would dominate for centuries.[207] Archimedes (287212 BC) designed a planetarium that could calculate the motions of the Moon and other objects in the Solar System.[208] In the 2nd century BC, Seleucus of Seleucia correctly theorized that tides were due to the attraction of the Moon, and that their height depends on the Moon's position relative to the Sun.[209] In the same century, Aristarchus computed the size and distance of the Moon from Earth, obtaining a value of about twenty times the radius of Earth for the distance.
Although the Chinese of the Han Dynasty believed the Moon to be energy equated to qi, their 'radiating influence' theory recognized that the light of the Moon was merely a reflection of the Sun, and Jing Fang (7837BC) noted the sphericity of the Moon.[204]:413414 Ptolemy (90168AD) greatly improved on the numbers of Aristarchus, calculating the values of a mean distance of 59times Earth's radius and a diameter of 0.292Earth diameters were close to the correct values of about 60 and 0.273 respectively.[210] In the 2nd century AD, Lucian wrote the novel A True Story, in which the heroes travel to the Moon and meet its inhabitants. In 499AD, the Indian astronomer Aryabhata mentioned in his Aryabhatiya that reflected sunlight is the cause of the shining of the Moon.[211] The astronomer and physicist Alhazen (9651039) found that sunlight was not reflected from the Moon like a mirror, but that light was emitted from every part of the Moon's sunlit surface in all directions.[212] Shen Kuo (10311095) of the Song dynasty created an allegory equating the waxing and waning of the Moon to a round ball of reflective silver that, when doused with white powder and viewed from the side, would appear to be a crescent.[204]:415416
During the Middle Ages, before the invention of the telescope, the Moon was increasingly recognised as a sphere, though many believed that it was "perfectly smooth".[213]
In 1609, Galileo Galilei used an early telescope to make drawings of the Moon for his book Sidereus Nuncius, and deduced that it was not smooth but had mountains and craters. Thomas Harriot had made, but not published such drawings a few months earlier.
Telescopic mapping of the Moon followed: later in the 17th century, the efforts of Giovanni Battista Riccioli and Francesco Maria Grimaldi led to the system of naming of lunar features in use today. The more exact 18341836 Mappa Selenographica of Wilhelm Beer and Johann Heinrich Mdler, and their associated 1837 book Der Mond, the first trigonometrically accurate study of lunar features, included the heights of more than a thousand mountains, and introduced the study of the Moon at accuracies possible in earthly geography.[214] Lunar craters, first noted by Galileo, were thought to be volcanic until the 1870s proposal of Richard Proctor that they were formed by collisions.[60] This view gained support in 1892 from the experimentation of geologist Grove Karl Gilbert, and from comparative studies from 1920 to the 1940s,[215] leading to the development of lunar stratigraphy, which by the 1950s was becoming a new and growing branch of astrogeology.[60]
After World War II the first launch systems were developed and by the end of the 1950s they reached capabilities that allowed the Soviet Union and the United States to launch spacecrafts into space. The Cold War fueled a closely followed development of launch systems by the two states, resulting in the so-called Space Race and its later phase the Moon Race, accelerating efforts and interest in exploration of the Moon.
After the first spaceflight of Sputnik 1 in 1957 during International Geophysical Year the spacecrafts of the Soviet Union's Luna program were the first to accomplish a number of goals. Following three unnamed failed missions in 1958,[216] the first human-made object Luna 1 escaped Earth's gravity and passed near the Moon in 1959. Later that year the first human-made object Luna 2 reached the Moon's surface by intentionally impacting. By the end of the year Luna 3 reached as the first human-made object the normally occluded far side of the Moon, taking the first photographs of it.The first spacecraft to perform a successful lunar soft landing was Luna 9 and the first vehicle to orbit the Moon was Luna 10, both in 1966.[60]
Following President John F. Kennedy's 1961 commitment to a manned Moon landing before the end of the decade, the United States, under NASA leadership, launched a series of uncrewed probes to develop an understanding of the lunar surface in preparation for human missions: the Jet Propulsion Laboratory's Ranger program, the Lunar Orbiter program and the Surveyor program. The crewed Apollo program was developed in parallel; after a series of uncrewed and crewed tests of the Apollo spacecraft in Earth orbit, and spurred on by a potential Soviet lunar human landing, in 1968 Apollo 8 made the first human mission to lunar orbit. The subsequent landing of the first humans on the Moon in 1969 is seen by many as the culmination of the Space Race.[217]
Neil Armstrong became the first person to walk on the Moon as the commander of the American mission Apollo 11 by first setting foot on the Moon at 02:56UTC on 21 July 1969.[218] An estimated 500million people worldwide watched the transmission by the Apollo TV camera, the largest television audience for a live broadcast at that time.[219][220] The Apollo missions 11 to 17 (except Apollo 13, which aborted its planned lunar landing) removed 380.05 kilograms (837.87lb) of lunar rock and soil in 2,196 separate samples.[221]
Scientific instrument packages were installed on the lunar surface during all the Apollo landings. Long-lived instrument stations, including heat flow probes, seismometers, and magnetometers, were installed at the Apollo 12, 14, 15, 16, and 17 landing sites. Direct transmission of data to Earth concluded in late 1977 because of budgetary considerations,[222][223] but as the stations' lunar laser ranging corner-cube retroreflector arrays are passive instruments, they are still being used.[224]Apollo 17 in 1972 remains the last crewed mission to the Moon. Explorer 49 in 1973 was the last dedicated U.S. probe to the Moon until the 1990s.
The Soviet Union continued sending robotic missions to the Moon until 1976, deploying in 1970 with Luna 17 the first remote controlled rover Lunokhod 1 on an extraterrestrial surface, and collecting and returning 0.3kg of rock and soil samples with three Luna sample return missions (Luna 16 in 1970, Luna 20 in 1972, and Luna 24 in 1976).[225]
A near lunar quietude of fourteen years followed the last Soviet mission to the Moon of 1976. Astronautics had shifted its focus towards the exploration of the inner (e.g. Venera program) and outer (e.g. Pioneer 10, 1972) Solar System planets, but also towards Earth orbit, developing and continuously operating, beside communication satellites, Earth observation satellites (e.g. Landsat program, 1972) space telescopes and particularly space stations (e.g. Salyut program, 1971).
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Nike Giannis Immortality 2 "Floral" FD0213-400 | SneakerNews.com
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After the Nike Zoom GT Cut 2 and Cosmic Unity 2 both indulged in an aesthetic fit with the clean-cut stones and gems, the Giannis Immortality 2 is establishing its own unique print graphic, imploring a multi-color floral illustration throughout its latest on-court proposition.
Dominated by a deep cyan hue that treats the entirety of the forefoots mesh construction and synthetic heel counter fit with raised perforated padding, the molded sole unit underfoot, embroidered eye stays and heel tab all render the presiding shade. Further accented by Sky Blue hits bearing the mudguard and lace overlays whereas bubblegum pinks emanate from the sock liner, medial side insignia and along the stitching of both the pull tab and midfoot. In stark contrast from the treads cream and grey build, the midfoots reverse Swoosh and upper tongue flaunt the boisterous splatter-paint graphic filled with floral hues before the established dark cyan returns to outfit the threaded 34 and Giannis emblem.
For a closer look at the Giannis Immortality 2 Floral, enjoy official images of the pair below while we await further release details as theyre made available by the Beaverton-based brand.
In other news from The Swooshes wheelhouse, the latest Zoom GT Cut 2 comes fit with aiming crosshairs.
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Our game portfolio includes the The One Ring RPG (Gold ENNIE for Best Interior Art 2022), the official ALIEN RPG (Gold ENNIE for Best Game 2020), the Gothic horror game Vaesen (winner.
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20/05/2022: Alien RPG: Officer (Career Guide) Doesn't sound like any radio signal I've ever heard. A guide on playing the Alien RPG Officer career for your character. ... Talents; Added Quick Build Functionality; Added Random Name Generator; Added CMOM Marine Weapon and Armor Stats to Character Sheet (will add this feature to Core Book Careers. ALIEN RPG Nexus - Counselor - Once per Turn, you can use the COMMAND skill to reduce the STRESS LEVEL of another character within SHORT range. [UNDER CONSTRUCTION!] Theres.
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Banter and Calming Presence. Banter allows a Marine to reduce the stress level of everyone at short range by one additional step (2 steps total) every turn. Calming Presence allows a Medic.
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It combines the Montero crew character sheets with more character info from the adventure, plus a rules reference sheet. Print it double-sided and you're good to go. I cannot.
Lifting/Forcing (basically, brute strength) Running/Jumping Swimming Dexterity Acrobatics/Contortion Piloting Reaction (saving throw) Sleight of Hand/Concealment Stealth Wrangling Intelligence Academics (history, politics, etc.) Commerce Crafting Demolition Gaming Investigation/Research (finding clues, interpreting data, making deductions) Medicine. Step 1: A person with a disability comes to PACE and is evaluated and counseled to determine talents and career goals. Step 2: Training is provided to polish the individuals unique talents and overcome obstacles. ... (281KB) The list of carparks with accessible parking spaces that. The U.S. Department of Transportation (DOT) issued a.
ALIEN RPG Nexus - Past the Limit - You can push any skill roll based on STRENGTH twice, not just once like other characters. [UNDER CONSTRUCTION!] Theres nothing we love more than the.
Save Save Alien RPG - Character Sheet - Printable For Later. 0 ratings 0% found this document useful (0 votes) 324 views 1 page. Alien RPG - Character Sheet - Printable. ... PERSONAL AGENDA NAME TALENTS. CAREER. RELATIONSHIPS BUDDY: APPEARANCE. RIVAL:.
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Steampunk is a subgenre of fantasy and speculative fiction that came into prominence in the 1980s and early 1990s. The term denotes works set in an era or world wherein steam power is still widely usedusually the 19th century, and often set in Victorian era Englandbut with prominent elements of either science fiction or fantasy, such as fictional technological inventions like those found ....
ALIEN RPG Nexus - Counselor - Once per Turn, you can use the COMMAND skill to reduce the STRESS LEVEL of another character within SHORT range. [UNDER CONSTRUCTION!] Theres.
A resource page of Stunts for Game Masters & Players playing Free League's Alien RPG. Stunts. Page 64 "The Skills" Heavy Machinery Stamina. Close Combat. Mobility. Piloting. Observation.. Talents are a useful but optional aspect of the game. They represent special abilities or shortcuts your character can take due to their high abilities with certain skills and high attributes. Each.
The job was routine, the money fair. Then the damn company diverted you to answer a distress call from a ship that disappeared almost 80 years ago a derelict carrying something bizarre, twisted, and alien. What the ship's frozen crew brought back with them was bad enough what they themselves were turning into was a bloody nightmare.
The ALIEN Roleplaying Game Cheat Sheet Tim Bannock. I don't know what Fria Ligan has done to me, but they sunk their claws in deep when they announced the ALIEN. ALIEN RPG - 4. TALENTS. 216 views. May 4, 2020. 4 Dislike Share Save. Mini Warzone. 2.99K subscribers. #alien #rpg Part 4 talks goes over talents. 17K views.
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ALIEN RPG CORE BOOK OVERVIEW Space is vast, dark, and not your friend. Gamma rays and neutrino bursts erupt from dying stars to cook you alive, black holes tear you apart, and the void itself boils your blood and seizes your brain. Try to scream and no one can hear youhold your breath and you rupture your lungs.
An almost-complete MSH RPG resource, containing a plethora of gaming material for a Classic Marvel campaign, including a heap of character profiles, custom rules, a lively message board, links, and much, much more..
Regular Talents Tier 1 Tier 2 Tier 3 Tier 4 Tier 5 Community Created Content Shadow of the Beanstalk Tier 1 Tier 2 Tier 3 Tier 4 Tier 5 Realms of Terrinoth Tier 1 Tier 2 Tier 3 Tier 4 Tier 5.
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ALIEN RPG - 4. TALENTS. 216 views. May 4, 2020. 4 Dislike Share Save. Mini Warzone. 2.99K subscribers. #alien #rpg Part 4 talks goes over talents. 17K views. Alien Races RPG Generator. If you want to create your own alien races with an advanced RPG generator powered by GPT-3 from OpenAI, head over to LitRPG Adventures and. I don't know what Fria Ligan has done to me, but they sunk their claws in deep when they announced the ALIEN Roleplaying Game coming later this year. I quickly pre-ordered, have been preparing to run the included starter scenario, and have devoured the content people are creating on the ALIEN RPG Forum.. Since I'm picky about what I want on my GM screen, I made the following cheat sheet.
Free League has also made an OGL of the base system rules, so the above could be seen as making use of information from there, just corrected to fit the Alien RPG itself. Should I get another infraction, I'll figure another way to share the information needed for character creation without breaking any giantitp rules.
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The Alien Roleplaying Game mixes together the claustrophobic feeling of the Alien movies with an intuitive rules system. As the tension of the scenario rises, your characters can increase.
While the original stats offered challenging gameplay, they relied heavily on an overpowered Hicks, Apone and Ripley in comparison to others. Hopefully these updated values while changing the dynamic of characters from the original game will hopefully make squads a bit more realistic. Refine Characters: Aliens. Alien 3.
The Alien 3: The Gun arcade game cabinet This is a chronological list of games in the Alien, Predator and Alien vs. Predator science fiction horror franchises. There have been thirty-eight officially licensed video games, one trading card game, and one tabletop miniatures game released as tie-ins to the franchises.
Sci-Fi Book Title Generator: 180+ Sci-Fi Title Ideas. August 22, 2021. Aliens, planets and futuristic cities - This sci-fi book title generator offers over 180 ideas for your science fiction novel. Whether you're just looking for inspiration, or need a slick title idea for an upcoming book - This sci-fi generator is simply out of this world!.110+ Sci-Fi Writing Prompts (+ Sci-Fi Story Idea. 20/05/2022: Alien RPG: Officer (Career Guide) Doesn't sound like any radio signal I've ever heard. A guide on playing the Alien RPG Officer career for your character. ... Talents; Added Quick Build Functionality; Added Random Name Generator; Added CMOM Marine Weapon and Armor Stats to Character Sheet (will add this feature to Core Book Careers.
The Star Wars Roleplaying Game is a tabletop role-playing game set in the Star Wars universe, first published by Fantasy Flight Games in 2012. It consists of different. It consists of different. Rise of the Separatists explores the early days of the Clone Wars , and is fully compatible with every Star Wars Roleplaying Game Line including Edge.
ALIEN uses an XP system. XP is earned by, at the end of each session, looking at a list of 8 questions and asking Did I do this thing? You get 1 xp for each yes. XP can be spent 5.
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Save Save Alien RPG - Character Sheet - Printable For Later. 0 ratings 0% found this document useful (0 votes) 324 views 1 page. Alien RPG - Character Sheet - Printable. ... PERSONAL AGENDA NAME TALENTS. CAREER. RELATIONSHIPS BUDDY: APPEARANCE. RIVAL:.
When hit, the Alien will run off into the nearest vent. When hit at the last moment before it kills the player, the Alien will take a chunk of your health before leaving. Be aware that even the Flame Thrower produces enough sound to attract the Alien from any location. Flare Distracts the Alien for about the same duration as a Noisemaker would.
IGN is the leading site for PC games with expert reviews, news, previews, game trailers, cheat codes, wiki guides & walkthroughs.
Sep 4, 2020. #1. So here's a new thread about one of my favourite new RPGs: Fria Ligan's ALIEN. The intention is to go through the book with two main aims: 1. A summary of the rules to help others see if they'd like it. 2. Some commentary on the setting material and how it relates to and expands previous material for the setting.
Characters have 4 Attributes and 12 skills that will sound familiar to anyone whose played a sci-fi RPG. Resolution is handled by adding your Attribute and Skill Values together and rolling that many six-sided dice. A 6 on any of those dice is a Success, anything else is failure. Oct 27, 2022 Key Findings. California voters have now received their mail ballots, and the November 8 general election has entered its final stage. Amid rising prices and economic uncertaintyas well as deep partisan divisions over social and political issuesCalifornians are processing a great deal of information to help them choose state constitutional officers and state legislators and to make ....
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An almost-complete MSH RPG resource, containing a plethora of gaming material for a Classic Marvel campaign, including a heap of character profiles, custom rules, a lively message board, links, and much, much more..
Here is a list of must-watch shows from 2019. 335 views. hinditrend Aug 02, 2021 8 netflix web series 2020 hindi, 9 netflix web series 2020 trailer, 10 netflix web series 2020 india, netflix web series 2020 english, netflix web series 2020 bollywood, best netflix web series 2020, new netflix web series 2020, upcoming netflix web series 2020. Solid Career Talents: Banter: In a colonial marine game, it's pretty much mandatory for at least one of them to have this talent as it's so very strong. Does demand that you be able to speak.
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Oct 11, 2022 IGN is the leading site for television show expert reviews, previews, episode guides, TV show wikis, video clips and cast interviews. r/alienrpg 3 yr. ago Posted by Limemobber Career Talents and Experience The book lists career talents that you choose one from when you create a character. Under experience it states you.
The rules for I, ALIEN are light, a scaffold to help the GM run her game. As such, the game as written is for GMs who are happy spending a lot of time improvising, and making. Our game portfolio includes the The One Ring RPG (Gold ENNIE for Best Interior Art 2022), the official ALIEN RPG (Gold ENNIE for Best Game 2020), the Gothic horror game Vaesen (winner.
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8 References Overview The Alien RPG is a powerful rocket launcher than is an excellent anti-armour and anti-air weapon, as well as an excellent crowd control weapon. The RPG is very similar to the Alien RPG, both firing extremely powerful projectiles that. Indian Talents are called Viddyharas ("Learned Ones"), Jewish Talents are called "Nephilim", and Russian Talents are called "Severch Loodi". Germans, the first country with known Talents, called their Talents the "bermenschen" (after the Nietzschean ideal of Super-men).
The Talents and Agenda/Story Cards sections allow the player/GM to drop talent and agenda items (see below) onto the characters sheet. Clicking on the items name will.
This includes Alien, Alien3, Alien Resurrection & Prometheus as well as the comics from Dark Horse. CHARACTERS RULES SCENARIOS WEAPONS Newest Characters Katherine Daniels.
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Renegade Military When a Corporate, Colonial Marine, or Mercenary force gets too dangerous to the common good, itis declared a Renegade by its superiors. The Colonial Marines are used to.
Alien: The Roleplaying Game is 400 pages in length, with the Colonial Marines Operations Manual coming in at 360 pages in length. The page length is less daunting than it.
This includes Alien, Alien3, Alien Resurrection & Prometheus as well as the comics from Dark Horse. CHARACTERS RULES SCENARIOS WEAPONS Newest Characters Katherine Daniels.
The Star Wars Roleplaying Game is a tabletop role-playing game set in the Star Wars universe, first published by Fantasy Flight Games in 2012. It consists of different. It consists of different. Rise of the Separatists explores the early days of the Clone Wars , and is fully compatible with every Star Wars Roleplaying Game Line including Edge.
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You can now pre-order Heart of Darkness, a new Cinematic scenario for the multiple award-winning ALIEN RPG.A pre-order gives immediate early access to a full PDF of the module, months ahead of the official release.Heart of Darkness is designed for 3-5 players plus the Game Mother and is a spiraling descent into soul-crushing madness.. In the Free League webshop, you can.
Banter and Calming Presence. Banter allows a Marine to reduce the stress level of everyone at short range by one additional step (2 steps total) every turn. Calming Presence allows a Medic. Talents are a useful but optional aspect of the game. They represent special abilities or shortcuts your character can take due to their high abilities with certain skills and high attributes. Each.
Alien The first film in the Alien franchise that introduced the world to Ripley and various stages of the Xenomorph. Aliens The second film in the Alien franchise and the basis for most of the recurring imagery of the series as well as the basic blueprint for the current versions of the world in which the alien series lives. Alien 3.
The Alien 3: The Gun arcade game cabinet This is a chronological list of games in the Alien, Predator and Alien vs. Predator science fiction horror franchises. There have been thirty-eight officially licensed video games, one trading card game, and one tabletop miniatures game released as tie-ins to the franchises.
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Master strategic match-3 combat in Puzzle Quest 3, the all-new installment to the globally renowned puzzle-RPG franchise. Prepare yourself for an epic journey across Etheria, a. ... Release: February 10, 2022. Edge of Eternity is an RPG that throws players into a world invaded by an alien force, turning the planet into a chaotic battle. The. Alien Rpg - Core Rulebook {Flfale002} - Free ebook download as PDF File (.pdf), Text File (.txt) or read book online for free. ... FACTS 13 ONLY ONE CHANCE 62 SKILLS 28 GROUP ROLLS 62.
Goon: SWADE Conversion - This short document helps you convert the most important rules and statistics from The Goon RPG to the Savage Worlds Ad. "/> Swade rpg pdf logitech warzone no recoil. This is a compilation of pdf share threads since 2015 and the rpg generals threads. Some things are from even earlier, like Lotsastuffs collection. Thanks Lotsastuff, your pdf was.
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#alien #rpgPart 4 talks goes over talents.
Oct 27, 2022 Key Findings. California voters have now received their mail ballots, and the November 8 general election has entered its final stage. Amid rising prices and economic uncertaintyas well as deep partisan divisions over social and political issuesCalifornians are processing a great deal of information to help them choose state constitutional officers and state legislators and to make ....
Hirelings = Dragon BACON! - Copy of Hirelings: the Ascent game, The Magic of Bacon cards, The Magic Of Bacon T-Shirt, and a copy of Flapjacks & Sasquatches now with a Side Of Bacon Expansion. 2 amazing games and all the Bacon products we produce! Flapjacks & Sasquatches 2nd edition is our stick it to your neighbor card game for 2-8. Its absolutely possible to play. 00.00.40: Introduction00.11.40: Welcome to our new patron: Hulot00.12.25: World of Gaming: War Stories delayed; Dave has some news; Jim McCarthy is running a Free League. Last Days of Hadleys Hope An Introduction to Alien RPG. Hadleys Hope is a shake and bake colony located on the moon LV-426. Established in 2157, the colony is a terraforming, research, and mining facility, and a new home to its pioneers. By 2179 there are 158 colonists there, and the first natives of LV-426 had been born.
ALIEN uses an XP system. XP is earned by, at the end of each session, looking at a list of 8 questions and asking Did I do this thing? You get 1 xp for each yes. XP can be spent 5.
The Star Wars Roleplaying Game is a tabletop role-playing game set in the Star Wars universe, first published by Fantasy Flight Games in 2012. It consists of different. It consists of different. Rise of the Separatists explores the early days of the Clone Wars , and is fully compatible with every Star Wars Roleplaying Game Line including Edge. ALIEN uses an XP system. XP is earned by, at the end of each session, looking at a list of 8 questions and asking Did I do this thing? You get 1 xp for each yes. XP can be spent 5. This is a list of notable tabletop role-playing games. It does not include computer role-playing games, MMORPGs, play-by-mail/email games, or any other video games with RPG elements.. Most of these games are tabletop role-playing games; other types of games are noted as such where appropriate. This is the official ALIEN tabletop roleplaying gamea universe of body horror and corporate brinkmanship, where synthetic people play god while space truckers and marines serve host to newborn ghoulish creatures. Its a harsh and unforgiving universe and you are nothing if not expendable. Display: 24 per page. Sort by: Featured.
Regular Talents Tier 1 Tier 2 Tier 3 Tier 4 Tier 5 Community Created Content Shadow of the Beanstalk Tier 1 Tier 2 Tier 3 Tier 4 Tier 5 Realms of Terrinoth Tier 1 Tier 2 Tier 3 Tier 4 Tier 5.
This includes Alien, Alien3, Alien Resurrection & Prometheus as well as the comics from Dark Horse. CHARACTERS RULES SCENARIOS WEAPONS Newest Characters Katherine Daniels.
Cheats codes du jeu Shining Force Gaiden - Ensei Jaishin no Kuni e sur Sega Game Gear - Jeu du genre RPG sorti en 1992 - Le Musee des Jeux Video vous propose des codes game genie, action replay, cheats, tips et secrets pour ce jeu. To open the console on PC, press TAB lol also provide cheats. Published Oct 24, 2018. 16. Alien RPG system for Foundry VTT. . Contribute to pwatson100/alienrpg development by creating an account on GitHub. ... Added the ability to add Stunt descriptions on the Skills tab. Toggling. Characters have four attributes: Strength, Agility, Wits, and Empathy which can vary between 2 to 5 during character creation based on choice of career and allocation of starting points. A characters Health equals their Strength score. Each attribute has 3 skills associated with it. The skills and their associated attributes are fairly intuitive.
The Star Wars Roleplaying Game is a tabletop role-playing game set in the Star Wars universe, first published by Fantasy Flight Games in 2012. It consists of different. It consists of different. Rise of the Separatists explores the early days of the Clone Wars , and is fully compatible with every Star Wars Roleplaying Game Line including Edge. Jun 20, 2011. Morrus is the owner of EN World and EN Publishing, creator of the ENnies, creator of the What's OLD is NEW (WOIN), Simply6, and Awfully Cheerful Engine game systems, and co-host of the weekly Morrus' Unofficial Tabletop RPG Talk podcast. He has been a game publisher and RPG community administrator for over 20 years, and has been reporting on D&D news for two.
An almost-complete MSH RPG resource, containing a plethora of gaming material for a Classic Marvel campaign, including a heap of character profiles, custom rules, a lively message board, links, and much, much more.. #alien #rpgPart 4 talks goes over talents.
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Talents are a useful but optional aspect of the game. They represent special abilities or shortcuts your character can take due to their high abilities with certain skills and high attributes. Each.
Animal Trainer Badass Beautiful One (prev. Bishounen) Body Builder Born to Fly Business Sense Camaraderie (GH2) Combat Medic Cyberpsycho Diplomatic Extropian Gate Crasher Hap-Ki-Do Hard as Nails Hull Down Idealist Blood Innovation (GH2) Jack of All Trades Kung-Fu Ninjitsu Presence Road Hog Robotics (GH2) Savant Scientific Method Sniper.
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Atheist Doctor Becomes a Believer After Near-Death Experiencer …
Posted: at 4:18 am
The following experience was shared by Joseph G., a police officer in Miami, Florida., on the Near Death Experience Research Foundation website:
I went to the emergency room of the hospital because of a bad reaction to a tetanus shot. While in the emergency room, I was given two shots of penicillin. After the second shot, I fell to the floor.
All of a sudden, I found myself floating at the ceiling, watching the turmoil going on in the room. My body was on the gurney jumping and shaking. The room was full people working on me; pounding on me.
The nurse who gave me the shots was sitting on the floor in the corner, hysterical. I saw them with the electric paddles trying to start my heart, with no luck. I thought I heard someone say that I was dead.
Suddenly, this doctor rushed into the room, shoving everyone out of the way. He was carrying this long syringe with a long needle and plunged it into my chest. That was the last thing I remember.
A week or so later, I suddenly woke up. I was in a hospital room. As I woke up, a doctor entered the room. I recognized him as the one with the needle. The first words I said to him were, I guess its a good thing you came when you did.
He was totally shocked! He asked the nurse who had I talked too? She told him, No one, he just woke up from a coma. He told the nurse that no one was to speak to me including her until he came back.
When he returned, he had a large group of doctors with him. He asked me to repeat what I said. I did. He said there was no way that I saw him, that I was dead by then. He asked me to tell him what else I remembered. I told them all I remembered as it happened and described all I saw.
They were all shocked because I was dead during the whole thing. I remember that later he told me that before my episode he was [an] atheist. But no more.
It was quite a story in the Miami Herald for quite a long time.
From that time until today, I dont fear dying, In fact I look forward to it. I feel that God rejected me, because he has some purpose for me.
Since that episode, I have had many experiences that would kill anyone else, but not me.
[For] example, right now, I am recovering from a broken neck. The top three [vertebrae] were broken and that usually results in being paralyzed.
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Atheist Doctor Becomes a Believer After Near-Death Experiencer ...
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Arrhythmia – Wikipedia
Posted: at 4:18 am
Group of medical conditions characterized by irregular heartbeat
Medical condition
Heart sounds of a girl experiencing arrhythmia after exercising.
Arrhythmias, also known as cardiac arrhythmias, heart arrhythmias, or dysrhythmias, are irregularities in the heartbeat, including when it is too fast or too slow.[2] A resting heart rate that is too fast above 100 beats per minute in adults is called tachycardia, and a resting heart rate that is too slow below 60 beats per minute is called bradycardia.[2] Some types of arrhythmias have no symptoms.[1] Symptoms, when present, may include palpitations or feeling a pause between heartbeats.[1] In more serious cases, there may be lightheadedness, passing out, shortness of breath or chest pain.[1] While most cases of arrhythmia are not serious, some predispose a person to complications such as stroke or heart failure.[2][3] Others may result in sudden death.[3]
Arrhythmias are often categorized into four groups: extra beats, supraventricular tachycardias, ventricular arrhythmias and bradyarrhythmias.[3] Extra beats include premature atrial contractions, premature ventricular contractions and premature junctional contractions.[3] Supraventricular tachycardias include atrial fibrillation, atrial flutter and paroxysmal supraventricular tachycardia.[3] Ventricular arrhythmias include ventricular fibrillation and ventricular tachycardia.[3][7] Bradyarrhythmias are due to sinus node dysfunction or atrioventricular conduction disturbances.[8] Arrhythmias are due to problems with the electrical conduction system of the heart.[2] A number of tests can help with diagnosis, including an electrocardiogram (ECG) and Holter monitor.[5]
Many arrhythmias can be effectively treated.[2] Treatments may include medications, medical procedures such as inserting a pacemaker, and surgery.[6] Medications for a fast heart rate may include beta blockers, or antiarrhythmic agents such as procainamide, which attempt to restore a normal heart rhythm.[6] This latter group may have more significant side effects, especially if taken for a long period of time.[6] Pacemakers are often used for slow heart rates.[6] Those with an irregular heartbeat are often treated with blood thinners to reduce the risk of complications.[6] Those who have severe symptoms from an arrhythmia or are medically unstable may receive urgent treatment with a controlled electric shock in the form of cardioversion or defibrillation.[6]
Arrhythmia affects millions of people.[4] In Europe and North America, as of 2014, atrial fibrillation affects about 2% to 3% of the population.[9] Atrial fibrillation and atrial flutter resulted in 112,000 deaths in 2013, up from 29,000 in 1990.[10] However, in most recent cases concerning the SARS-CoV2 pandemic, cardiac arrhythmias are commonly developed and associated with high morbidity and mortality among patients hospitalized with the COVID-19 infection, due to the infection's ability to cause myocardial injury.[11] Sudden cardiac death is the cause of about half of deaths due to cardiovascular disease and about 15% of all deaths globally.[12] About 80% of sudden cardiac death is the result of ventricular arrhythmias.[12] Arrhythmias may occur at any age but are more common among older people.[4] Arrhythmias may also occur in children; however, the normal range for the heart rate varies with age.[3]
Sound of an irregular heart rhythm.
Sound of a racing heart during an episode of tachyarrhythmia.
Arrhythmia may be classified by rate (tachycardia, bradycardia), mechanism (automaticity, re-entry, triggered) or duration (isolated premature beats; couplets; runs, that is 3 or more beats; non-sustained = less than 30 seconds or sustained= over 30 seconds).[citation needed]
Arrhythmias are also classified by site of origin:[citation needed]
These are also known as AV blocks, because the vast majority of them arise from pathology at the atrioventricular node. They are the most common causes of bradycardia:[citation needed]
First, second, and third-degree blocks also can occur at the level of the sinoatrial junction. This is referred to as sinoatrial block typically manifesting with various degrees and patterns of sinus bradycardia.[citation needed]
Sudden arrhythmic death syndrome (SADS), is a term used as part of sudden unexpected death syndrome to describe sudden death because of cardiac arrest occasioned by an arrhythmia in the presence or absence of any structural heart disease on autopsy. The most common cause of sudden death in the US is coronary artery disease specifically because of poor oxygenation of the heart muscle, that is myocardial ischemia or a heart attack[15] Approximately 180,000 to 250,000 people die suddenly of this cause every year in the US. SADS may occur from other causes. There are many inherited conditions and heart diseases that can affect young people which can subsequently cause sudden death without advance symptoms.[16]
Causes of SADS in young people include viral myocarditis, long QT syndrome, Brugada syndrome, Catecholaminergic polymorphic ventricular tachycardia, hypertrophic cardiomyopathy and arrhythmogenic right ventricular dysplasia.[17][18]
Arrhythmias may also occur in the fetus.[19] The normal heart rate of the fetus is between 110 and 160 beats per minute. Any rhythm beyond these limits is abnormal and classed as a fetal arrhythmia. These are mainly the result of premature atrial contractions, usually give no symptoms, and have little consequence. However, around one percent of these will be the result of significant structural damage to the heart.[19]
The term cardiac arrhythmia covers a very large number of very different conditions.[citation needed]
The most common symptom of arrhythmia is an awareness of an abnormal heartbeat, called palpitations. These may be infrequent, frequent, or continuous. Some of these arrhythmias are harmless (though distracting for patients) but some of them predispose to adverse outcomes.[citation needed]
Some arrhythmias do not cause symptoms and are not associated with increased mortality. However, some asymptomatic arrhythmias are associated with adverse events. Examples include a higher risk of blood clotting within the heart and a higher risk of insufficient blood being transported to the heart because of a weak heartbeat. Other increased risks are of embolization and stroke, heart failure, and sudden cardiac death.[citation needed]
If an arrhythmia results in a heartbeat that is too fast, too slow, or too weak to supply the body's needs, this manifests as lower blood pressure and may cause lightheadedness, dizziness, syncope or brain death due to insufficient supply of blood to the brain.[20]
Some types of arrhythmia result in cardiac arrest, or sudden death.[citation needed]
Medical assessment of the abnormality using an electrocardiogram is one way to diagnose and assess the risk of any given arrhythmia.[citation needed]
Cardiac arrhythmia are caused by one of two major mechanism. The first of arrhythmia is a result of enhanced or abnormal impulse formation originating at the pacemaker or the His-Purkinje network. The second is due to reentry conduction disturbances.[21]
Cardiac arrhythmia is often first detected by simple but nonspecific means: auscultation of the heartbeat with a stethoscope, or feeling for peripheral pulses. These cannot usually diagnose specific arrhythmia but can give a general indication of the heart rate and whether it is regular or irregular. Not all the electrical impulses of the heart produce audible or palpable beats; in many cardiac arrhythmias, the premature or abnormal beats do not produce an effective pumping action and are experienced as "skipped" beats.[citation needed]
The simplest specific diagnostic test for assessment of heart rhythm is the electrocardiogram (abbreviated ECG or EKG). A Holter monitor is an EKG recorded over a 24-hour period, to detect arrhythmias that may happen briefly and unpredictably throughout the day.[citation needed]
A more advanced study of the heart's electrical activity can be performed to assess the source of the aberrant heart beats. This can be accomplished in an electrophysiology study, an endovascular procedure that uses a catheter to "listen" to the electrical activity from within the heart, additionally if the source of the arrhythmias is found, often the abnormal cells can be ablated and the arrhythmia can be permanently corrected. Transesophageal atrial stimulation (TAS) instead uses an electrode inserted through the esophagus to a part where the distance to the posterior wall of the left atrium is only approximately 56mm (remaining constant in people of different age and weight).[22] Transesophageal atrial stimulation can differentiate between atrial flutter, AV nodal reentrant tachycardia and orthodromic atrioventricular reentrant tachycardia.[23] It can also evaluate the risk in people with WolffParkinsonWhite syndrome, as well as terminate supraventricular tachycardia caused by re-entry.[23]
Each heartbeat originates as an electrical impulse from a small area of tissue in the right atrium of the heart called the sinus node or sinoatrial node (SA node). The impulse initially causes both atria to contract, then activates the atrioventricular node (AV node), which is normally the only electrical connection between the atria and the ventricles (main pumping chambers). The impulse then spreads through both ventricles via the bundle of His and the Purkinje fibers causing a synchronized contraction of the heart muscle and, thus, the pulse.[citation needed]
In adults, the normal resting heart rate ranges from 60 to 90 beats per minute. The resting heart rate in children is much faster. In athletes, however, the resting heart rate can be as slow as 40 beats per minute, and be considered normal.[citation needed]
The term sinus arrhythmia[24] refers to a normal phenomenon of alternating mild acceleration and slowing of the heart rate that occurs with breathing in and out respectively. It is usually quite pronounced in children and steadily decreases with age. This can also be present during meditation breathing exercises that involve deep inhaling and breath holding patterns.[25]
A slow rhythm (less than 60 beats/min) is labelled bradycardia. This may be caused by a slowed signal from the sinus node (sinus bradycardia), by a pause in the normal activity of the sinus node (sinus arrest), or by blocking of the electrical impulse on its way from the atria to the ventricles (AV block or heart block). Heart block comes in varying degrees and severity. It may be caused by reversible poisoning of the AV node (with drugs that impair conduction) or by irreversible damage to the node. Bradycardias may also be present in the normally functioning heart of endurance athletes or other well-conditioned persons. Bradycardia may also occur in some types of seizures.[citation needed]
In adults and children over 15, resting heart rate faster than 100 beats per minute is labeled tachycardia. Tachycardia may result in palpitation; however, tachycardia is not necessarily an arrhythmia. Increased heart rate is a normal response to physical exercise or emotional stress. This is mediated by the sympathetic nervous system on the sinus node and called sinus tachycardia. Other conditions that increase sympathetic nervous system activity in the heart include ingested or injected substances, such as caffeine or amphetamines, and an overactive thyroid gland (hyperthyroidism) or anemia.[citation needed]
Tachycardia that is not sinus tachycardia usually results from the addition of abnormal impulses to the normal cardiac cycle. Abnormal impulses can begin by one of three mechanisms: automaticity, re-entry, or triggered activity. A specialized form of re-entry which is both common and problematic is termed fibrillation.[citation needed]
Although the term "tachycardia" has been known for over 160 years, bases for the classification of arrhythmias are still being discussed.[citation needed]
Congenital heart defects are structural or electrical pathway problems in the heart that are present at birth. Anyone can be affected by this because overall health does not play a role in the problem. Problems with the electrical pathway of the heart can cause very fast or even deadly arrhythmias. WolffParkinsonWhite syndrome is due to an extra pathway in the heart that is made up of electrical muscle tissue. This tissue allows the electrical impulse, which stimulates the heartbeat, to happen very rapidly. Right ventricular outflow tract tachycardia is the most common type of ventricular tachycardia in otherwise healthy individuals. This defect is due to an electrical node in the right ventricle just before the pulmonary artery. When the node is stimulated, the patient will go into ventricular tachycardia, which does not allow the heart to fill with blood before beating again. Long QT syndrome is another complex problem in the heart and has been labeled as an independent factor in mortality. There are multiple methods of treatment for these including cardiac ablations, medication treatment, or lifestyle changes to have less stress and exercise.[citation needed]
Automaticity refers to a cardiac muscle cell firing off an impulse on its own. All of the cells in the heart have the ability to initiate an action potential; however, only some of these cells are designed to routinely trigger heartbeats. These cells are found in the conduction system of the heart and include the SA node, AV node, Bundle of His, and Purkinje fibers. The sinoatrial node is a single specialized location in the atrium that has a higher automaticity (a faster pacemaker) than the rest of the heart and, therefore, is usually responsible for setting the heart rate and initiating each heartbeat.[citation needed]
Any part of the heart that initiates an impulse without waiting for the sinoatrial node is called an ectopic focus and is, by definition, a pathological phenomenon. This may cause a single premature beat now and then, or, if the ectopic focus fires more often than the sinoatrial node, it can produce a sustained abnormal rhythm. Rhythms produced by an ectopic focus in the atria, or by the atrioventricular node, are the least dangerous dysrhythmias; but they can still produce a decrease in the heart's pumping efficiency because the signal reaches the various parts of the heart muscle with different timing than usual and can be responsible for poorly coordinated contraction.[citation needed]
Conditions that increase automaticity include sympathetic nervous system stimulation and hypoxia. The resulting heart rhythm depends on where the first signal begins: If it is the sinoatrial node, the rhythm remains normal but rapid; if it is an ectopic focus, many types of dysrhythmia may ensue.
Re-entrant arrhythmias occur when an electrical impulse recurrently travels in a tight circle within the heart, rather than moving from one end of the heart to the other and then stopping.[26][27]
Every cardiac cell can transmit impulses of excitation in every direction but will do so only once within a short time. Normally, the action potential impulse will spread through the heart quickly enough that each cell will respond only once. However, if there is some essential heterogeneity of refractory period or if conduction is abnormally slow in some areas (for example in heart damage) so the myocardial cells are unable to activate the fast sodium channel, part of the impulse will arrive late and potentially be treated as a new impulse. Depending on the timing, this can produce a sustained abnormal circuit rhythm.
As a sort of re-entry, vortices of excitation in the myocardium (autowave vortices) are considered to be the main mechanism of life-threatening cardiac arrhythmias.[28] In particular, the autowave reverberator is common in the thin walls of the atria, sometimes resulting in atrial flutter. Re-entry is also responsible for most paroxysmal supraventricular tachycardia, and dangerous ventricular tachycardia. These types of re-entry circuits are different from WPW syndromes, which utilize abnormal conduction pathways.
Although omega-3 fatty acids from fish oil can be protective against arrhythmias, they can facilitate re-entrant arrhythmias.[29]
When an entire chamber of the heart is involved in multiple micro-reentry circuits and is, therefore, quivering with chaotic electrical impulses, it is said to be in fibrillation.
Fibrillation can affect the atrium (atrial fibrillation) or the ventricle (ventricular fibrillation): ventricular fibrillation is imminently life-threatening.
CPR can prolong the survival of the brain in the lack of a normal pulse, but defibrillation is the only intervention that can restore a healthy heart rhythm. Defibrillation is performed by applying an electric shock to the heart, which resets the cells, permitting a normal beat to re-establish itself.
Triggered beats occur when problems at the level of the ion channels in individual heart cells result in abnormal propagation of electrical activity and can lead to a sustained abnormal rhythm. They are relatively rare and can result from the action of anti-arrhythmic drugs, or after depolarizations.[citation needed]
The method of cardiac rhythm management depends firstly on whether the affected person is stable or unstable. Treatments may include physical maneuvers, medications, electricity conversion, or electro- or cryo-cautery.[citation needed]
In the United States, people admitted to the hospital with cardiac arrhythmia and conduction disorders with and without complications were admitted to the intensive care unit more than half the time in 2011.[30]
Several physical acts can increase parasympathetic nervous supply to the heart, resulting in blocking of electrical conduction through the AV node. This can slow down or stop several arrhythmias that originate above or at the AV node (see main article: supraventricular tachycardias). Parasympathetic nervous supply to the heart is via the vagus nerve, and these maneuvers are collectively known as vagal maneuvers.
There are many classes of antiarrhythmic medications, with different mechanisms of action and many different individual drugs within these classes. Although the goal of drug therapy is to prevent arrhythmia, nearly every antiarrhythmic drug has the potential to act as a pro-arrhythmic, and so must be carefully selected and used under medical supervision.
Several groups of drugs slow conduction through the heart, without actually preventing an arrhythmia. These drugs can be used to "rate control" a fast rhythm and make it physically tolerable for the patient.[citation needed]
Some arrhythmias promote blood clotting within the heart and increase the risk of embolus and stroke. Anticoagulant medications such as warfarin and heparins, and anti-platelet drugs such as aspirin can reduce the risk of clotting.
Arrhythmias may also be treated electrically, by applying a shock across the heart either externally to the chest wall, or internally to the heart via implanted electrodes.[31]
Cardioversion is either achieved pharmacologically or via the application of a shock synchronized to the underlying heartbeat. It is used for the treatment of supraventricular tachycardias. In elective cardioversion, the recipient is usually sedated or lightly anesthetized for the procedure.
Defibrillation differs in that the shock is not synchronized. It is needed for the chaotic rhythm of ventricular fibrillation and is also used for pulseless ventricular tachycardia. Often, more electricity is required for defibrillation than for cardioversion. In most defibrillation, the recipient has lost consciousness so there is no need for sedation.
Defibrillation or cardioversion may be accomplished by an implantable cardioverter-defibrillator (ICD).
Electrical treatment of arrhythmias also includes cardiac pacing. Temporary pacing may be necessary for reversible causes of very slow heartbeats, or bradycardia (for example, from drug overdose or myocardial infarction). A permanent pacemaker may be placed in situations where the bradycardia is not expected to recover.
Some cardiologists further sub-specialize into electrophysiology. In specialized catheter laboratories, they use fine probes inserted through the blood vessels to map electrical activity from within the heart. This allows abnormal areas of conduction to be located very accurately and subsequently destroyed by heat, cold, electrical, or laser probes in a process called catheter ablation.
This procedure may be completely curative for some forms of arrhythmia, but for others, the success rate remains disappointing. AV nodal reentrant tachycardia is often curable by ablating one of the pathways in the AV node (usually the slow pathway). Atrial fibrillation can also be treated, by performing a pulmonary vein isolation, but the results are less reliable.
Arrhythmias due to medications have been reported since the 1920s with the use of quinine.[32] In the 1960s and 1970s problems with antihistamines and antipsychotics were discovered.[32] It was not until the 1980s that the underlying issue, QTc prolongation was determined.[32]
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Cav1.1 – Wikipedia
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Mammalian protein found in Homo sapiens
Cav1.1 also known as the calcium channel, voltage-dependent, L type, alpha 1S subunit, (CACNA1S), is a protein which in humans is encoded by the CACNA1S gene.[5] It is also known as CACNL1A3 and the dihydropyridine receptor (DHPR, so named due to the blocking action DHP has on it).
This gene encodes one of the five subunits of the slowly inactivating L-type voltage-dependent calcium channel in skeletal muscle cells. Mutations in this gene have been associated with hypokalemic periodic paralysis, thyrotoxic periodic paralysis and malignant hyperthermia susceptibility.[5]
Cav1.1 is a voltage-dependent calcium channel found in the transverse tubule of muscles. In skeletal muscle it associates with the ryanodine receptor RyR1 of the sarcoplasmic reticulum via a mechanical linkage. It senses the voltage change caused by the end-plate potential from nervous stimulation and propagated by sodium channels as action potentials to the T-tubules. It was previously thought that when the muscle depolarises, the calcium channel opens, allowing calcium in and activating RyR1, which mediates much greater calcium release from the sarcoplasmic reticulum. This is the first part of the process of excitation-contraction coupling, which ultimately causes the muscle to contract. Calcium entry through Cav1.1 is not required in skeletal muscle, as it is in cardiac muscle; Cav1.1 undergoes a conformational change which allosterically activates RyR1.[6]
In hypokalemic periodic paralysis (HOKPP), the voltage sensors in domains 2 and 4 of Cav1.1 are mutated (loss-of-function), reducing the availability of the channel to sense depolarisation, and therefore it cannot activate the ryanodine receptor as efficiently. As a result, the muscle cannot contract very well and the patient is paralysed. The condition is hypokalemic because a low extracellular potassium ion concentration will cause the muscle to repolarise to the resting potential more quickly, so any calcium conductance that does occur cannot be sustained. It becomes more difficult to reach the threshold at which the muscle can contract, and even if this is reached then the muscle is more prone to relaxing. Because of this, the severity would be reduced if potassium ion concentrations are maintained. In contrast, hyperkalemic periodic paralysis refers to gain-of-function mutations in sodium channels that maintain muscle depolarisation and therefore are aggravated by high potassium ion concentrations.[7]
The European Malignant Hyperthermia Group accepts two mutations in CACNA1S as diagnostic for malignant hyperthermia.[8]
Cav1.1 is blocked by dihydropyridine.
This article incorporates text from the United States National Library of Medicine, which is in the public domain.
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