ISS016-E-012616 (24 Nov. 2007) --- Astronaut Peggy Whitson, Expedition 16 commander, participates in a session of extravehicular activity (EVA) as construction continues on the International Space Station. During the 7-hour, 4-minute spacewalk Whitson and astronaut Daniel Tani (out of frame), flight engineer, continued the external outfitting of the Harmony node in its new position in front of the Destiny laboratory. The blackness of space and Earth's horizon provide the backdrop for the scene.