CAPE CANAVERAL, Fla. - Viewed from inside the Payload Changeout Room on Launch Pad 39A at NASA's Kennedy Space Center in Florida, the Super Lightweight Interchangeable Carrier is installed behind the shuttle external airlock (top) in space shuttle Atlantis’ payload bay for the STS-125 mission. 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

CAPE CANAVERAL, Fla. - 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

CAPE CANAVERAL, Fla. - In At NASA's Kennedy Space Center in Florida, the payload ground handling mechanism in the Payload Changeout Room on Launch Pad 39A is viewed from the rear as it transfers 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

CAPE CANAVERAL, Fla. - In the Payload Changeout Room on Launch Pad 39A at NASA's Kennedy Space Center in Florida, a worker uses the payload ground handling mechanism to install the payload for the STS-125 mission 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

CAPE CANAVERAL, Fla. - On Launch Pad 39A at NASA's Kennedy Space Center in Florida, the Super Lightweight Interchangeable Carrier is installed behind the shuttle external airlock (top) in space shuttle Atlantis’ payload bay for the STS-125 mission. 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

CAPE CANAVERAL, Fla. - In the Payload Changeout Room on Launch Pad 39A at NASA's Kennedy Space Center in Florida, the payload for the STS-125 mission is ready to be moved 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