Why NASA Is Exploring An Alien World In Antarctica

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This image made by the NASA/ESA Hubble Space Telescope shows part of a group of five galaxies known as Stephan's Quintet. NASA, ESA, Hubble SM4 ERO Team /AP hide caption

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NASA, ESA, Hubble SM4 ERO Team /AP

'Are We Alone?' Churchill Concludes It's Likely Life Circles Other Suns

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Winston Churchill Ponders Extraterrestrial Life In Newly Discovered Essay

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This is the actual NASA graphic illustrating the "Space Poop Challenge." NASA hide caption

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NASA

Space Poop Problem-Solvers Take Home Cash Prizes From NASA

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Look Up! Astronomer Details Upcoming Trifecta Of Celestial Activity

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Astronauts May Hold Football Passing Record

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Moon Express Reaches Finals In Google Lunar Xprize Competition

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For years, the satellites that make up America's Global Position System have been carrying sensors that measure the weather in space. This image illustrates the orbital planes in which GPS satellites travel around Earth. Courtesy of Los Alamos National Laboratory hide caption

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Courtesy of Los Alamos National Laboratory

Apollo 1 astronauts Ed White (from left), Gus Grissom and Roger Chaffee, 1967. The astronauts died as a result of a fire in the cockpit during a training session on Jan. 27, 1967. Keystone/Hulton Archive/Getty Images hide caption

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Keystone/Hulton Archive/Getty Images

50 Years Later, NASA Creates Tribute To 3 Astronauts Who Died In Space Race

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Funeral Service Will Remember Gene Cernan, Last Man To Walk On The Moon

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A composite image of Earth taken at 1:07 p.m. ET on Jan. 15 by the GOES-16 satellite. National Oceanic and Atmospheric Administration hide caption

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National Oceanic and Atmospheric Administration