Hans Schlegel space walking

In the darkness of space, ESA astronaut Hans Schlegel, STS-122 mission specialist, participates in the mission's second spacewalk as construction and maintenance continue on the International Space Station. During the six-hour, 45-minute spacewalk, among other tasks, Hans and NASA astronaut Rex Walheim (out of frame), mission specialist, worked to replace a nitrogen tank used to pressurise the Station's ammonia cooling system.