Stock Photo - European Space Agency astronaut Timothy Peake, Expedition 4647 flight engineer, 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.Robert Markowitz

Stock Photo: European Space Agency astronaut Timothy Peake, Expedition 4647 flight engineer, attired in a training version of his Extravehicular Mobility Unit (EMU).

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