Scott Altman Specialist John Grunsfeld arrive to get ready for launch aboard space shuttle Atlantis.

STS-125 Commander Scott Altman (in front) and Mission Specialist John Grunsfeld arrive at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida aboard a T-38 training jet to get ready for launch aboard space shuttle Atlantis on May 11. Altman will be making his fourth shuttle flight; Grunsfeld, his fifth. Atlantis' crew will service NASA's Hubble Space Telescope for the fifth and final time. The flight will include five spacewalks during which astronauts will refurbish and upgrade the telescope with state-of-the-art science instruments. As a result, Hubble's capabilities will be expanded and its operational lifespan extended through at least 2014. Photo credit: NASA/Jim Grossmann