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Two NASA astronauts switched their spacesuits to battery power this morning at 7:20 a.m., EDT aboard the International Space Station to begin a spacewalk planned to last about 2.5 hours. Expedition 51 Commander Peggy Whitson and Flight Engineer Jack Fischer will replace a critical computer relay box.

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On Friday, 19 May, Tabbys star began to dim, carrying on a history of mysterious dips in brightness. Astronomers are scrambling to point as many telescopes as possible at the star, which is 1,3 light-years away in the constellation Cygnus, to decipher its strange signal. Link

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Our Universe could be one of an infinite number of Universes, and, in its early stages, might have collided with one of these other worlds, according to a recent discovery. A mysterious cold spot in the Universe is not caused by a massive void, according to a recent paper. Link

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The nascent off-Earth manufacturing industry is getting set to take its next big steps. Made In Space, the California-based company that owns and operates the commercial 3D printer aboard the International Space Station (ISS), is developing new technology, called Archinaut, that's designed to enable the assembly of large structures in the final frontier. Link

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Expedition 51 Commander Peggy Whitson and Flight Engineer Jack Fischer of NASA concluded the 2 ISS spacewalk at 1:21 p.m. EDT. Link

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Researchers have formed the clearest picture yet of massive explosions that controlled the creation of galaxies, including own, and continue to influence star formation today. The findings confirm a long-held theory about the after-effects of these spectacular explosions called supernovae, and how they slow down the formation process. Link

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The record-shattering mission of the U.S. Air Force's robotic X-37B space plane is finally over. After circling Earth for an unprecedented 718 days, the X-37B touched down Sunday (May 7) at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida the first landing at the SLF since the final space shuttle mission came back to Earth in July 2 Link

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Amazing imagery from Cassini Link

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Adam Makarenko wants to change the way we look at space so he creates miniature exoplanets in his living room in Toronto, Canada. Makarenko, 43, has been creating models since 2 and began building exoplanets in 2 Link

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A newly discovered exoplanet is causing excitement among astronomers as it has the potential to give us the best opportunity ever to find alien life. The 'super-Earth', which is around 1.4 times the size of Earth but seven times its mass, is rocky, temperate and orbits a quiet star in galactic neighbourhood. Link

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The first sighting of a halo of hydrogen wafting around the Milky Way has been revealed today. It was thought galaxy had this kind of halo of diffuse gas, based on what we knew about other galaxies, but it had never been directly observed until now. Spiral galaxies like the Milky Way are made up of a central bulge surrounded by a disk and spiral arms, but these only make up a tiny part of its mass. It is thought the bulk of the missing mass is made up of dark matter, which does not interact with light so cannot be seen. Link.

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Two veteran NASA missions are providing new details about icy, ocean-bearing moons of Jupiter and Saturn, further heightening the scientific interest of these and other "ocean worlds" in solar system and beyond. The findings are presented in papers published Thursday by researchers with NASAs Cassini mission to Saturn and Hubble Space Telescope. Link

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Later today, Nasa will be making an announcement about the presence of oceans in Solar System. While little detail has been given, Nasa has said the mysterious news comes from data gathered by the Cassini spacecraft and the Hubble space telescope. The full announcement will be made at 19: BST (14: EDT). Link

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Most scientific papers on the discovery of new galaxies are notable because they find something out of the ordinary. Now, a new galaxy has been discovered which is special because it is so average. Link

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About four billion years ago, Mars was warm. Water flowed in lakes and rivers under a nice thick blanket of atmosphere. But then something cataclysmic happened. Mars' insulating atmosphere all but disappeared. Exposed to the harsh elements of space, the red planet became the dry, frozen wasteland that it is today. Until now, this missing atmosphere had baffled scientists; was it lost in space, or did the Martian crust reabsorb it? New data from NASA's Mars Atmosphere and Volatile EvolutioN (MAVEN) mission is settling the debate. Bruce Jakowski and others on the MAVEN team have calculated that most of Mars' atmosphere blew away in the solar winds. Link

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The particles making up dark matter could be identified through gravitational waves, according to a recent study. The research, led by ina Arvanitaki at the Perimeter Institute and colleagues from Stanford and NYU, says the question about what the Universe is made of could be answered by using the Ligo detectors. These instruments were made famous last year when they saw gravitational waves for the first time, created by the merger of two black holes. Link

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Traditionally, rockets are one-use only - all the elements of the vehicle are discarded in getting a satellite payload into orbit. But SpaceX has become adept at landing its boosters safely back on Earth after a mission. Now, the firm is ready to put one of these "flight proven" vehicles on the launch pad again. Link

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The ExoMars mobile rover, tasked with recovering evidence of life on the Red Planet, will touch down in 2 at one of two sites, scientists announced Wednesday. "After intense discussions, we have voted for the sites Oxia Planum and Mawrth Vallis," Frances Westhall, head of research at the Center for Molecular Biophysics in Orleans, France, told journalists. Link

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NASAS HIGHLY EXPERIMENTAL Earth Observing-1 satellite mission was supposed to last just a year. It did that, and then survived 16 moreall the while testing NASAs riskiest, oddball ideas. Its been a proving ground for everything from multi- and hyperspectral imagers, to a self-piloting AI. But EO-1 is finally out of fuel, and at the end of the month the crafts operating team will close up shop. Link

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More than ten years ago, astronomers made a discovery that has puzzled them ever since supermassive black holes appeared to have popped up soon after the start of the Universe. It is thought to take billions of years for supermassive black holes to form, but at least 20 of them were spotted at the dawn of the Universe, just 800 million years after the Big Bang. A team of researchers from Dublin City University, Columbia University, Georgia Tech, and the University of Helsin...ki, have now used computer simulations to attempt to solve the mystery. The results, published today, say a black hole can grow quickly if the galaxy it is in stops forming stars.

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Few things have so forcefully driven home the wonder, and fragility, of life as that iconic image of Earth set against the vast expanse of space. And so of course it appears among the 225 photos in Apollo VII XVII, the stunning photo book Dutch designer Simon Phillipson wrote with designers Floris Heyne, Joel Meter and Delano Steenmeijer. Link

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These raw, unprocessed images of Saturn's tiny moon, Pan, were taken on March 7, 2 by NASA's Cassini spacecraft. The flyby had a close-approach distance of 24,572 kilometers (15,268 miles). These images are the closest images ever taken of Pan and will help to characterize its shape and geology. Link

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Astronomers have peered back more than 13 billion light years to find a huge mass of glowing stars the most distant galaxy ever found to contain cosmic dust. The discovery gives us a completely new look at when the very first stars were 'born' and could reveal more about how the Universe expanded. Link

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Speaking at the Planetary Science Vision 2 Workshop conference in Washington, director of Nasas Planetary Science Division James Green said scientists from the space agency have proposed a plan to shield Mars from the Suns rays through an artificial magnetic field around the planet. Without a protective magnetic field, anyone living on the Red Planet would have to protect themselves from the harmful radiation from the Sun that we, on Earth, are shielded from. Green described the idea as involving a magnetic shield launched in a stable orbit between Mars and the Sun. It would be made of a large electric circuit powerful enough to generate an artificial magnetic field. Link

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Link share a great video of the annular solar eclipse took place over South America and Africa.

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A link between the amount of material that can be seen spewing out of a black hole, and the brightness of the black hole itself has been identified for the first time. Michael Parker from Cambridge University was studying distant galaxies to learn about a poorly understood phenomenon of black holes when he stumbled across this unique feature around the active galactic nuclei AGN IRAS 1322438 Link

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Anybody who longs to see an alien world up close got an exciting gift last year. In August, researchers reported the discovery of a potentially habitable, Earth-sized planet orbiting the Suns closest stellar neighbour Proxima Centauri, a mere 1.3 parsecs, or 4.22 light years, away. Link

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At the heart of galaxy, a vast black hole is devouring matter from the dust clouds that surround it. Little by little, expanses of interstellar material are being swallowed up by this voracious galactic carnivore that, in the process, has reached a mass that is 4m times that of sun. Link

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Link Spitzer Space Telescope has revealed the first known system of seven Earth-size planets around a single star. Three of these planets are firmly located in the habitable zone, the area around the parent star where a rocky planet is most likely to have liquid water. The discovery sets a new record for greatest number of habitable-zone planets found around a single star outside solar system. All of these seven planets could have liquid water key to life as we know it under the right atmospheric conditions, but the chances are highest with the three in the habitable zone.

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SpaceX has launched the first private rocket from the same historic site that saw some of NASA's greatest space missions, then landed a booster nearby in a resounding success. The California-based company's Falcon 9 rocket launched a robotic Dragon cargo capsule toward the International Space Station today (Feb. 19) at 9:39 a.m. EST (1439 GMT) from Launch Complex 39A at NASA's Kennedy Space Center the same pad that once hosted Apollo moon missions and space shuttle launches. Link

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Churchill ponders the conditions that make for a habitable world, and on considering the vast number of stars perhaps circled by alien planets, comes to the conclusion that the answer to the essays title question, Are We Alone in the Universe?, was surely a resounding no. Link

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A new dataset released by the Carnegie Institution for Science and MIT includes around 61, measurements of 1,6 nearby stars. The information, which was collected by Hawaiis W.M. Keck Observatory over the course of two decades, is being released in an effort to crowdsource the search for additional planets. Link

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Tim Peake, the first British astronaut to stay on the International Space Station (ISS), is heading back to space. In a surprise announcement during an event at the Science Museum, Peake revealed he would return to the ISS with the European Space Agency. The British astronaut only returned from orbit in June 2 Link

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The commercial space industry pushes a particular brand of optimism. Its urge to inspire manifests as soaring soundtracks to three-minute mission-promo videos, press releases with words like humanity, and slick graphics of spacecraft that dont exist yet but could any day now. In the particular case of asteroid mining, business leaders are selling a future in which materials plucked from space rocks make up for Earths shortfalls and support a thriving civilization. Link

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NASAs Juno Spacecraft is currently orbiting Jupiter, taking some spectacular images as it studies the gas giants atmosphere. The spacecraft is making its next close pass to the planet on February 2nd, and the agency is asking the public to help it figure out where to point one of its cameras next. Juno will approach Jupiters North Pole and will swing south, ending the flyby below the South Pole and will take pictures using JunoCam, a visible-light camera. NASA noted that the spacecraft is limited by the amount of onboard data storage is has onboard, so it has to be picky with what it takes pictures of. The mission planners have opened up a voting system for the public to help select what pictures they will take, and will open up voting during upcoming flybys as well. Link

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On Saturday, SpaceX triumphantly returned to flight after an accident last September. The company launched 1 satellites into an orbit 625km above the Earth's surface, and, as a bonus, SpaceX also demonstrated its increasing mastery of rocket landings by bringing the first stage booster back to a drone ship off the California coast. SpaceX has now successfully landed seven rockets back on Earth. Link

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Astronomers studying a binary star system about 1,8 light years from the Sun say they are increasingly confident that the two stars will merge into a luminous red nova in about five years. At its brightest, the spectacular explosion produced by this nova could reach an apparent magnitude of about 2. akin to a bright star in the night sky, making it visible even from most urban areas. Link

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On December 3 the White House quietly released its Near-Earth Object Preparedness Strategy, a 25-page document outlining the United States plans in the event that a giant asteroid is found to be on a collision course with Earth. Among the priorities outlined by the strategy are improving Near-Earth Object (NEO) detection, developing methods for deflecting asteroids, and developing interagency emergency procedures in the event of an NEO impact. Link

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Asteroids are some of the last unexplored territories in the solar system. To help fill in some of the blanks, NASA just announced two upcoming missions that will visit new types of asteroids in the 2030s. Launching in 2023, the Psyche spacecraft will fly into the asteroid belt between Mars and Jupiter to explore an asteroid quite unlike the balls of mud, ice, and rock we've studied before; "16 Psyche" is a giant hunk of metal. Measuring 130 miles in diameter, it's thought to be made of iron and nickel. 16 Psyche may be the leftover core of a protoplanetan infant world as large as Mars. Violent collisions are thought to have blasted away its rocky outer layers, leaving behind an asteroid very similar to Earth's own metallic core.

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New Horizons continues to deliver the goods. Having sent back all of the data collected during its Pluto flyby in 2 the spacecraft is still speeding along at a velocity of 14.32 kilometers per second relative to the Sun. That has allowed it to travel almost halfway between Pluto and its next target, a small Kuiper Belt object called 2 MU69. By last Sunday, in fact, it had come to within two years of its flyby dateJanuary 1, 2 Link

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The best observatory in the world is arguably divided among three sites in northern ChileLa Silla, Paranal, and Chajnantor. Each location in the high, arid Atacama desert offers excellent dark and clear skies for the European Southern Observatory's suite of telescopes. At 2,635 meters in elevation Paranal boasts the best instruments, with four 8.2-meter telescopes combining to make up the Very Large Telescope. Such an observatory also fulfills another, more human purpose. Outside of light-polluted cities (and even countrysides in developed countries), the dark skies above the Atacama offer perspective on Earth's minuscule corner of the observable Universe. Link

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Happy new year and best wishes for 2017!

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Water ice has been found on the dwarf planet Ceres, data from Nasa's Dawn spacecraft has revealed. The discovery of the ice makes Ceres the third planetary body to have the substance within solar system, after the Moon and Mercury. Link

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We have some exciting news. We have an update for iOS app going live tomorrow! The standard version will get some new features and the opportunity to update from Redshift to Redshift Pro with an In App Purchase. These are the new Redshift features (update 3.0):... - Lunar/planetary gazetteers - 3D-model of the Milky Way galaxy - Extended Todays Sky panel (visibility of space stations, events in the sky and weather tonight) - Notification about todays events at startup - Dictionary of Astronomy - In-App Purchase Upgrade to Redshift Pro Redshift Pro will also be updated and will then be available in the same 10 languages as Redshift standard (update 1.1) - Spanish, Italian, Dutch, Portuguese, Chinese, and Japanese localisations - Access to the GAIA DR1 online catalog of 1.1 billion stars - 3D-area of stars from the Hipparcos and Tycho-2 catalogs in the Milky Way galaxy

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This movie, based on images taken by ESAs Mars Express, highlights Mawrth Vallis, a 6 km-long, 2 km-deep outflow channel at the boundary of the southern highlands and the northern lowlands of Mars. Link

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John Glenn, former astronaut and US senator for almost quarter of a century, has died in Ohio aged 95. Glenn became a national hero in 1962 when he became the first American to orbit the Earth, one year after the Soviet Union had sent their own man into orbit, Yuri Gagarin. Glenn was the third US astronaut in space and the first American in orbit, circling the Earth three times. Link

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Hyperion, one of Saturn's small moons, orbits the planet in such a chaotic manner that it's impossible to predict. Link

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An uncrewed Russian spacecraft meant to resupply the International Space Station has been lost. Roscosmos, Russias space agency, says that communication with the spacecraft ended 382 seconds into the flight. The third stage of the Soyuz rocket, which helps propel the cargo ship to its final orbit, reportedly shut down earlier than planned according to NASAs live broadcast of the mission. The Progress MS- spacecraft never made it into proper orbit without that full third stage burn. Instead, gravity took hold and it burned up in the Earths atmosphere sometime in the hours after the 9:51AM ET launch from the Baikonur Cosmodrome in Kazakhstan. Reports of explosions and fireballs in the sky of Tuva, Russia around the same time. Link

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NASA offers live HD Earth viewing from the International Space Station - go full screen, sit back, watch and enjoy home planet. Link

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International Astronomical Union formally approves 227 star names Link

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