STS-125 mission specialist John Grunsfeld is about to attach a tether during a May 16, 2009, spacewalk to perform work on the Hubble Space Telescope. This was the third of five planned spacewalks for the mission.
STS-125 mission specialist John Grunsfeld is about to attach a tether during a May 16, 2009, spacewalk to perform work on the Hubble Space Telescope. This was the third of five planned spacewalks for the mission.Image Credit: NASA