Astronauts Michael Good and Mike Massimino (partially obscured), both STS-125 mission specialists, participate in the mission's fourth session of extravehicular activity (EVA4) as work continued to refurbish and upgrade the Hubble Space Telescope. During the eight-hour, two-minute spacewalk, Massimino and Good made repairs and improvements to the Space Telescope Imaging Spectrograph (STIS) that has helped extend Hubble's life.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/144614754@N02">NASA Hubble Space Telescope</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/nasahubble/27564267993/">STS-125 MS1 Good and MS4 Massimino during EVA4</a>