Astronaut John Grunsfeld performs work on the Hubble Space Telescope as the first of five STS-125 spacewalks kicks off a week's worth of work on the orbiting observatory. Grunsfeld, a spacewalk veteran who previously worked on the telescope, will participate in two of the remaining four sessions of extravehicular activity later in the mission.
Astronaut John Grunsfeld performs work on the Hubble Space Telescope as the first of five STS-125 spacewalks kicks off a week’s worth of work on the orbiting observatory. Grunsfeld, a spacewalk veteran who previously worked on the telescope, will participate in two of the remaining four sessions of extravehicular activity later in the mission.Image Credit: NASA