Stock Photo - Astronaut Steve Bowen, STS-126 mission specialist, participates in the mission's fourth and final scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, seven-minute spacewalk, Bowen and astronaut Shane Kimbrough (out of frame), mission specialist, completed the lubrication of the port Solar Alpha Rotary Joints (SARJ) as well as other station assembly tasks. Bowen returned to the starboard SARJ to install the final trundle bearing assembly, retracted a berthing mechanism latch on the Japanese Kibo Laboratory and reinstalled its thermal cover. Bowen also installed a video camera on the Port 1 truss and attached a Global Positioning System antenna on the Japanese Experiment Module Pressurized Section.