In the Vehicle Assembly Building at NASA's Kennedy Space Center, the external tank for space shuttle Atlantis is lowered toward the solid rocket boosters (the nose cone of one of the boosters is seen here) 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