ISS Expedition 10 commander Leroy Chiao and flight engineer Salizhan Sharipov work outside the space station during their mission's first spacewalk. Chiao's red-striped legs and feet are visible at the upper left of this image, while Sharipov appears near the center behind the Matroiska radiation experiment, a Russian instrument designed to mimic the human body in space. Credit: NASA TV. Click to enlarge.
