In the Vehicle Assembly Building at NASA's Kennedy Space Center, the external tank for space shuttle Atlantis is lowered into high bay 3 toward the solid rocket boosters for mating. The tank and boosters will be secured on the mobile launcher platform below. Atlantis' STS-125 mission is the fifth and final shuttle servicing mission to NASA’s Hubble Space Telescope. Launch is targeted for Oct. 8. Photo credit: NASA/Jack Pfaller