American astronaut Christina Koch holds the record for the longest spaceflight by a woman, having spent 328 days on the International Space Station (ISS). In March 2019 she traveled to the ISS on the Russian spacecraft Soyuz MS-12 and returned to Earth in February 2020. She also spent 10 days in space as a mission specialist on the Artemis II mission (April 1–10, 2026).
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