Stock Photo - Astronaut Daniel Tani, Expedition 16 flight engineer, prepares to exit the airlock prior to a Nov. 20 spacewalk to perform work on the International Space Station. Astronaut Peggy Whitson (out of frame), Expedition 16 commander, also participated in the spacewalk.

Stock Photo: Astronaut Daniel Tani, Expedition 16 flight engineer, prepares to exit the airlock prior to a Nov. 20 spacewalk to perform work on the International Space.

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