Stock Photo - European Space Agency astronaut Frank DeWinne (foreground), Expedition 20 flight engineer and Expedition 21 commander; and Canadian Space Agency astronaut Robert Thirsk, Expedition 2021 flight engineer, participate in a training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center. Crew instructor Valori Leinmiller assisted the crewmembers. Photographer: Mark Sowa

Stock Photo: European Space Agency astronaut Frank DeWinne (foreground), Expedition 20 flight engineer and Expedition 21 commander; and Canadian Space Agency astronaut.

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