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NASA astronaut, and one-year crew member Scott Kelly, will retire from the agency, effective April 1. Kelly joined the astronaut corps in 1996 and, with 520 days in space accumulated over four missions, he currently holds the American record for most time spent in space. After retiring, Kelly will continue to participate in the ongoing research related to his one-year mission. He will provide periodic medical samples and support other testing in much the same way that his twin brother, f