Stock Photo - NASA astronaut Jeff Williams (right), Expedition 47 flight engineer and Expedition 48 commander; and Canadian Space Agency astronaut David Saint-Jacques participate in a space station EVA planning and preparation session in an International Space Station mock-uptrainer in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center. Crew instructor Megan Murphey assists Williams and Saint-Jacques.James Blair

Stock Photo: NASA astronaut Jeff Williams (right), Expedition 47 flight engineer and Expedition 48 commander; and Canadian Space Agency astronaut David Saint-Jacques.

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