Stock Photo - Astronaut Heidemarie M. Stefanyshyn-Piper, STS-115 mission specialist, works near the Solar Alpha Rotary Joint (SARJ) during the Sept. 12 spacewalk, which she shared with astronaut Joseph R. Tanner (out of frame). The two participated in the first of three scheduled STS-115 extravehicular activity (EVA) sessions as the Atlantis astronauts and the Expedition 13 crew members join efforts this week to resume construction of the International Space Station.

Stock Photo: Astronaut Heidemarie M. Stefanyshyn-Piper, STS-115 mission specialist, works near the Solar Alpha Rotary Joint (SARJ) during the Sept.

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