NASA astronaut Rex Walheim on the ISS robotic arm
NASA astronaut Rex Walheim on the ISS robotic arm
NASA astronaut Rex Walheim during his second extra-vehicular activity on 13 February 2008. Walheim is suspended from the robotic arm (Canadarm2) of the International Space Station ISS, holding a nitrogen tank. The nitrogen tank, which is the size of a refrigerator, is used in cooling the ISS.
