On Launch Pad 39A the payload canister is lifted toward the payload changeout room above.

On Launch Pad 39A at NASA's Kennedy Space Center, the payload canister is lifted toward the payload changeout room above. The canister contains four carriers holding various equipment for the STS-125 mission aboard space shuttle Atlantis to service NASA’s Hubble Space Telescope. The changeout room is the enclosed, environmentally controlled portion of the rotating service structure that supports cargo delivery to the pad and subsequent vertical installation into the shuttle’s payload bay. Launch of Atlantis is targeted for Oct. 10. Photo credit: NASA/Jack Pfaller