Atlantis' external tank and solid rocket boosters are ready on the mobile launcher platform for mating.

In high bay 3 of the Vehicle Assembly Building, Atlantis' external tank and solid rocket boosters are ready on the mobile launcher platform for mating with the orbiter Atlantis, being lowered by a crane. After the stacking, Atlantis will undergo a shuttle interface test and other prelaunch processing. Atlantis' launch window begins Aug. 28. During its 11-day mission to the International Space Station, the STS-115 crew of six astronauts will continue construction of the station and install their cargo, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Troy Cryder