Astronaut At Work
](http://www.nasa.gov/multimedia/imagegallery/imagefeature1104.html)[ [](http://www.nasa.gov/multimedia/imagegallery/imagefeature1104.html)â¦
 Astronaut Ron Garan works on assigned tasks during the last scheduled spacewalk of the STS-124 mission specialist. During the six-hour, 33-minute spacewalk, Garan and fellow astronaut Mike Fossum exchanged a depleted Nitrogen Tank Assembly for a new one, removed thermal covers and launch locks from the Kibo laboratory, reinstalled a repaired television camera onto the space stationâs left P1 truss,and retrieved samples of a dust-like substance from the left Solar Alpha Rotary Joint for analysis by experts on the ground. Busy day!