Astronaut Scott Kelly, who recently completed an unprecedented yearlong mission aboard the International Space Station (ISS) and holds the American record for most days spent off Earth, will retire from NASA on April 1, agency officials announced today (March 11).
After his retirement, Kelly will continue to participate in the research related to his one-year space mission, which was designed to help pave the way for crewed missions to Mars by shedding light on the ways long-duration spaceflight affects the human body psychologically and physiologically.
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