Astronaut John M. Grunsfeld foreground, payload commander, traverses along the longerons of the Space Shuttle Columbia while astronaut Richard M. Linnehan, mission specialist, uses the Remote Manipulator System's robotic arm to move around as they participate in the first of five STS-109 Extravehicular Activities EVAs to perform work on the Hubble Space Telescope HST. Linnehan and Grunsfeld are preparing to stow an old solar array in the Columbia's payload bay that will be replaced by a new one.
