S125-E-008131 (16 May 2009) --- Astronaut Andrew Feustel, STS-125 mission specialist, positioned on a foot restraint on the end of Atlantis? remote manipulator system (RMS), participates in the mission?s third session of extravehicular activity (EVA) as work continues to refurbish and upgrade the Hubble Space Telescope. During the six-hour, 36-minute spacewalk, Feustel and astronaut John Grunsfeld (out of frame), mission specialist, removed the Corrective Optics Space Telescope Axial Replacement and installed in its place the new Cosmic Origins Spectrograph. They also completed the Advanced Camera for Surveys electronic card replacement work, and completed part 2 of the ACS repair, installing a new electronics box and cable.