Astronaut C. Michael Foale, standing on the end of Discovery's remote manipulator system (RMS), which had hoisted him to a task station on the Hubble Space Telescope (HST), uses a tool during the second space walk for the STS-103 mission. Astronauts Foale and Claude Nicollier are the second pair of STS-103 mission specialists to abandon the shirt-sleeve environment of Discovery's cabin for several hours' tasks on this the third NASA servicing mission to HST. The photo was taken with an electronic still camera (ESC).