Astronaut Steve Bowen, NASA mission STS-126 specialist, participates in the mission's third scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station, on November 22, 2008. During the six-hour, 57-minute spacewalk, Bowen and astronaut Heidemarie Stefanyshyn-Piper (out of frame), mission specialist, focused their efforts on the continued cleaning of the station's starboard solar alpha rotary joint (SARJ) and the removal and replacement of trundle bearing assemblies (TBA). Bowen and Piper also cleaned the area around the SARJ's drive lock assemblies, which help the joint to rotate and lock into place. (UPI Photo/NASA)