S115-E-05758 (12 Sept. 2006) --- Astronaut Heidemarie M. Stefanyshyn-Piper, STS-115 mission specialist, pauses for a moment during the Sept. 12 spacewalk, which she shared with astronaut Joseph R. Tanner. The two participated in the first of three scheduled STS-115 extravehicular activity (EVA) sessions as the Atlantis astronauts and the Expedition 13 crewmembers join efforts this week to resume construction of the International Space Station.