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