Astronauts Vande Hei and Acaba at the Arlington National Cemeter

CANDID - ASTRONAUT LIND, DONALD L. - JSC

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Astronaut Don Pettit's fingers are refracted in this sphere of water

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NASA media portrait of new 2017 Astronaut Candidate

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Astronaut Suni Williams assembles research hardware

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NASA media portrait of new 2017 Astronaut Candidate

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Astronauts Vande Hei and Acaba at the Arlington National Cemeter

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Astronaut Serena Auñon-Chancellor at Air and Space Museum

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NASA media portrait of new 2017 Astronaut Candidate

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Astronauts Vande Hei and Acaba at the Arlington National Cemeter

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SHEPARD, ALAN B., ASTRONAUT - MISC. - PA

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LEAVING PAD - ASTRONAUT JOHN W. YOUNG - TRAINING

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NASA media portrait of new 2017 Astronaut Candidate

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Official Astronaut Portrait of Greg Johnson in ACES suit

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CCP Astronauts in Boeing CST-100 Trainer

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Official Astronaut Portrait of Greg Johnson in ACES suit

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Official Astronaut Portrait of Greg Johnson in ACES suit

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CCP Astronauts - NASA T-38 Aircraft Operations

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Astronaut Butch Wilmore works on science maintenance tasks

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Astronaut Butch Wilmore performs spacesuit maintenance

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NASA astronaut Chris Williams is pictured during a spacewalk

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Astronaut Don Pettit works on weekend housekeeping duties

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Official NASA portrait of British astronaut Timothy Peake

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Astronaut Don Pettit takes a break and poses for a portrait

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JAXA astronaut Takuya Onishi organizes cargo bags

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