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KENNEDY SPACE CENTER, FLA. - After its overnight rollout from the Vehicle Assembly Building, Space Shuttle Atlantis rests on the hard stand on Launch Pad 39B. The shuttle sits on top of the mobile launcher platform. The crawler, which transported it, is still underneath. To the left is the rotating service structure, with the payload changeout room (PCR) open. When the shuttle's payload is transported to the pad, it will be lifted into the PCR, the service structure will rotate to enclose the shuttle and the payload will be installed in Atlantis' payload bay. The slow speed of the crawler results in a 6-hour trek to the pad approximately 4 miles away. Atlantis' launch window begins Aug. 27 for an 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