Astronaut John M. Grunsfeld, payload commander, gives a "thumbs up" signal to crewmates inside Space Shuttle Columbia's crew cabin during a task on the Hubble Space Telescope (HST) in the cargo bay of the shuttle during the STS-109 mission's third space walk. The primary purpose of the extravehicular activity (EVA) of astronauts Grunsfeld and Richard M. Linnehan was to replace the Power Control Unit on the giant telescope.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/144614754@N02">NASA Hubble Space Telescope</a>
Taken on 6 March 2002
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/nasahubble/27990754846/">Astronaut John M. Grunsfeld EVA</a>