What happens to our bodies if we spend an extended amount of time in space? That's what NASA hopes to find out over the next year by studying two identical twin astronauts, one of which will remain on Earth while the other goes to space.
Mark Kelly, whose wife, former U.S. Representative Gabrielle Giffords, was shot in early 2011 at an Arizona political event, will stay on the ground, and his brother, Scott, heads to the International Space Station for a year. This is the longest spaceflight ever attempted by NASA.
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