STS-125 crew members listen to a trainer review emergency exit procedures from the pad.

Near the bunker on Launch Pad 39A at NASA's Kennedy Space Center in Florida, STS-125 crew members listen to a trainer review emergency exit procedures from the pad. From left are Commander Scott Altman, Mission Specialists Mike Massimino and Megan McArthur, Pilot Gregory C. Johnson and Mission Specialist Michael Good. Not clearly visible are Mission Specialists Andrew Feustel and John Grunsfeld. Space shuttle Atlantis' 11-day flight is targeted for launch May 12 and will include five spacewalks to 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/Cory Huston