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NASA astronaut Scott Kelly: My year in space will test genetics

NASA astronaut Scott Kelly speaks with TODAY's Natalie Morales about his upcoming year-long stay at the International Space Station, which will test how he holds up in zero gravity compared to his identical twin, Mark Kelly.
/ Source: TODAY

NASA astronaut Scott Kelly speaks with TODAY’s Natalie Morales about his upcoming year-long stay at the International Space Station, which will test how he holds up in zero gravity compared to his identical twin, Mark Kelly.