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NASA's Celebrated "Twins Study" Shows What Spaceflight Does To Human Body

Friday, April 12, 2019, 1:29 PM

Astronaut Scott-Kelly made himself a guinea pig for all the people who dream of human journeys to Mars and other destinations in space. In 2015, Kelly rode rocket into space and spent nearly a year on International-Space-Station in low Earth orbit, while his identical twin brother, Mark Kelly, stayed on Earth's surface for NASA's celebrated "twins-study," designed to see what spaceflight does to human-body.