Stock Photo - NASA astronaut Tim Kopra (left), Expedition 46 flight engineer and Expedition 47 commander; and European Space Agency astronaut Timothy Peake, Expedition 4647 flight engineer, participate in an extravehicular activity (EVA) maintenance training session in the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Crew instructor Sandy Moore assists the crew members.Lauren Harnett

Stock Photo: NASA astronaut Tim Kopra (left), Expedition 46 flight engineer and Expedition 47 commander; and European Space Agency astronaut Timothy Peake.

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