STS-125 Mission Specialists Grunsfeld and Feustel during EVA5

Astronauts John Grunsfeld (left) and Andrew Feustel, both STS-125 mission specialists, participate in the mission's fifth and final session of extravehicular activity (EVA5) as work continues to refurbish and upgrade the Hubble Space Telescope. During the seven-hour and two-minute spacewalk, Grunsfeld and Feustel installed a replacement battery module, removed and replaced a Fine Guidance Sensor, and installed three thermal blankets (NOBLs) that protect Hubble's electronics.