From NASA: "Astronaut Andrew Feustel works on the Hubble Space Telescope in this image from NASA TV May 18, 2009. Shuttle Atlantis astronauts returned to the Hubble Space Telescope on Monday for a final spacewalk to install fresh batteries, thermal shields and a sensor to pinpoint celestial targets for research. Lead spacewalker John Grunsfeld and Feustel left the shuttle's air lock at about 8:30 a.m. EDT (1230 GMT), almost an hour ahead of schedule."
Pictures from the Hubble telescope, through the years. Aren't they pretty?