Stock Photo - European Space Agency (ESA) astronaut Frank De Winne (seated left), Expedition 20 flight engineer and Expedition 21 commander; and Canadian Space Agency astronaut Robert Thirsk, Expedition 2021 flight engineer, participate in an Environmental Control and Life Support System (ECLSS) training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center. ECLSS instructor Valori Leinmiller assisted the crewmembers. Photographer: Devin Boldt
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