Workers check data on the payload ground handling mechanism or PGHM in the Payload Changeout Room on Launch Pad 39A.

At NASA's Kennedy Space Center in Florida, workers check data on the payload ground handling mechanism, or PGHM, in the Payload Changeout Room on Launch Pad 39A. The PGHM is being used to transfer the STS-125 mission payload into space shuttle Atlantis’ payload bay. STS-125 is the fifth and final shuttle servicing mission for NASA’s Hubble Space Telescope. The payload comprises four carriers holding various equipment for the mission. Atlantis is targeted to launch Oct. 14 on the 11-day mission. Photo credit: NASA/Jack Pfaller