S103-E-5320 (23 December 1999) --- Astronauts C. Michael Foale (left) and Claude Nicollier work on the Hubble Space Telescope (HST)in Discovery's aft cargo bay during their shared space walk to perform servicing tasks on the Hubble Space Telescope (HST). A desert area on Earth forms the backdrop for the photo. Nicollier, part of the astronaut corps since 1980, represents the European Space Agency (ESA). Foale, one of NASA's astronauts who had spent several months aboard Russia's Mir Space Station, is an alumnus of the 1987 class of astronaut candidates. The photo was taken with an electronic still camera (ESC).