NASA astronaut John.

NASA astronaut John ?Danny? Olivas, STS-128 mission specialist, participates in the mission's second session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six-hour, 39-minute spacewalk, Olivas and European Space Agency astronaut Christer Fuglesang (out of frame), mission specialist, installed the new Ammonia Tank Assembly on the Port 1 Truss and stowed the empty tank assembly into the Space Shuttle Discovery?s cargo bay.