Stock Photo - NASA astronaut Terry Virts (right), Expedition 42 flight engineer and Expedition 43 commander; Russian cosmonaut Anton Shkaplerov and European Space Agency astronaut Samantha Cristoforetti, both Expedition 4243 flight engineers, pose for a portrait following an Expedition 4243 preflight press conference at NASA's Johnson Space Center.Robert Markowitz

Stock Photo: NASA astronaut Terry Virts (right), Expedition 42 flight engineer and Expedition 43 commander; Russian cosmonaut Anton Shkaplerov and European Space Agency.

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