Commander Scott Altman wearing cap is greeted at NASA's Kennedy Space Center in Florida.

STS-125 Commander Scott Altman (wearing cap) is greeted by Shuttle Launch Director Mike Leinbach at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida. Altman and the other members of the STS-125 crew arrived aboard T-38 training jets to get ready for launch aboard space shuttle Atlantis on May 11. Altman will be making his fourth shuttle flight. 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