Atlantis: Ready for Launch
Credit: AP
Space shuttle Atlantis STS-135 crew, from left to right, Commander Chris Ferguson, Pilot Doug Hurley, Mission Specialist's Sandra Magnus and Rex Walheim make their way to a simulator for launch and ascent training at Johnson Space Center Thursday, June 16, 2011, in Houston. The crew is being prepared for a July 8, 2011 mission that will bring a close to the space shuttle program. (AP Photo/David J. Phillip)
