Stock Photo - NASA astronaut Tim Kopra (right), Expedition 46 flight engineer and Expedition 47 commander, attired in a training version of his Extravehicular Mobility Unit (EMU) spacesuit, awaits the start of a spacewalk training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. NASA astronaut Jeff Williams, Expedition 47 flight engineer and Expedition 48 commander, assists Kopra.Robert Markowitz

Stock Photo: NASA astronaut Tim Kopra (right), Expedition 46 flight engineer and Expedition 47 commander, attired in a training version of his Extravehicular Mobility Unit.

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