In the Vehicle Assembly Building at NASA's Kennedy Space Center, space shuttle Atlantis is lowered alongside the external fuel tank and twin solid rocket boosters in high bay 3. Atlantis will be mated to the tank and boosters stacked on the mobile launcher platform. After additional preparations are made, the shuttle will be rolled out to Launch Pad 39A to prepare for launch on the STS-125 mission targeted for 1:34 a.m. EDT Oct. 8. Photo credit: NASA/Dimitri Gerondidakis