Expedition 51 is the 51st expedition to the ISS. Peggy Whitson, Oleg Novitskiy, and Thomas Pesquet will be transferred from Expedition 50. Fyodor Yurchikhin and Jack Fischer will launch on the Soyuz MS-04, bringing the crew total to 5.
Peggy Whitson is the intended commander of Expedition 51, the first woman to command two expeditions to the ISS, having previously commanded Expedition 16.
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