U.S. astronaut Peggy Whitson breaks the 534-day U.S. record for cumulative time in space, April 24, 2017. She marked the occasion by speaking with President Donald Trump about plans for human trips to Mars. (Photo/Agencies)
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U.S. astronaut Peggy Whitson breaks the 534-day U.S. record for cumulative time in space, April 24, 2017. She marked the occasion by speaking with President Donald Trump about plans for human trips to Mars. (Photo/Agencies)
