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