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NASA astronaut Scott Kelly is returning to Earth today, after spending nearly a year aboard the International Space Station. The idea behind his extended stay is to help NASA better prepare for trips into deep space. The microgravity environment can have some interesting effects on the human body, and NASA wants to know how astronauts will fare on lengthy missions to Mars. Subscribe: http://goo.gl/G5RXGs Check out our full video catalog: http://goo.gl/lfcGfq Visit our playlists: http://goo.gl/94XbKx Like The Verge on Facebook: http://goo.gl/2P1aGc Follow on Twitter: http://goo.gl/XTWX61 Follow on Instagram: http://goo.gl/7ZeLvX Read More: http://www.theverge.com