Astronaut John M. Grunsfeld, payload commander, signals readiness for the first of his STS-109 space walks to perform work on the Hubble Space Telescope (HST). Astronauts Grunsfeld and Richard M. Linnehan later donned their helmets and extravehicular mobility unit (EMU) space suits and egressed the Space Shuttle Columbia, eventually replacing the giant telescope’s starboard solar array during a space walk on March 4, 2002.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/144614754@N02">NASA Hubble Space Telescope</a>
Taken on 4 March 2002
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/nasahubble/27990757386/">Astronaut John M. Grunsfeld</a>