Stock Photo - NASA astronaut Terry Virts, Expedition 42 flight engineer and Expedition 43 commander, uses a microphone during an emergency scenario training session in an International Space Station mock-uptrainer in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center. Robert Markowitz

Stock Photo: NASA astronaut Terry Virts, Expedition 42 flight engineer and Expedition 43 commander, uses a microphone during an emergency scenario training session in an.

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