Astronaut Anne McClain wears an experimental wearable dosimeter

Astronaut Sultan Alneyadi is inside the seven window cupola

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STS-127 astronauts Chris Cassidy and Tom Marshburn

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Astronauts in the windows of the orbiter as seen during EVA

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CCP Astronauts - CST-100 Mini MOST Simulation

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Robonaut joint task operations with astronaut Nancy Currie.

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Astronauts Vande Hei and Acaba at the Arlington National Cemeter

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STS 125 crew training. Astronauts Massimino and Good

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Astronaut Scott Tingle at McKinley Technology High School

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STS-125 crew training. Astronauts Grunsfeld and Feustel

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Astronaut Serena Auñon-Chancellor at Air and Space Museum

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STS-127 astronauts Chris Cassidy and Tom Marshburn

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NASA astronaut Mike Fincke poses next to a spacesuit

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Astronaut Anna Fisher visits Operations and Checkout building

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Astronauts Stafford and Brand at controls of Apollo Command Module

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Astronaut Anna Fisher visits Operations and Checkout building

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Astronauts Vande Hei and Acaba at the Arlington National Cemeter

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JAXA astronaut Kimiya Yui inspects and cleans hardware

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Expedition 21 astronauts Jeff Williams and Nicole Stott

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Astronaut Blaha on aft flight deck in communication with Mir

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Astronaut Jonny Kim installs experimental hydrogen sensors

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Astronauts Bresnik and Nespoli at National Air and Space Museum

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STS-127 astronauts Chris Cassidy and Tom Marshburn

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Astronauts Bresnik and Nespoli at National Air and Space Museum

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Astronaut Jonny Kim installs experimental hydrogen sensors

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