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CAPE CANAVERAL, Fla. - Workers in the Payload Changeout Room, or PCR, on Launch Pad 39A at NASA's Kennedy Space Center in Florida study the cargo in the payload canister. The cargo comprises four carriers holding various equipment for the STS-125 mission aboard space shuttle Atlantis to service NASA’s Hubble Space Telescope. From top to bottom are the Multi-Use Logistic Equipment carrier, the Flight Support System carrier, the Orbital Replacement Unit Carrier and the Super Lightweight Interchangeable Carrier. Using the payload ground-handling mechanism, or PGHM, they will transfer the cargo into the PCR. The PGHM removes payloads from a transportation canister and installs them into the shuttle. It is essentially NASA’s largest fork-lift. Atlantis is targeted to launch Oct. 10. Photo credit: NASA/Jim Grossmann