KENNEDY SPACE CENTER, FLA. -- The rotating service structure (left) on Launch Pad 39B is rolled back to reveal Space Shuttle Atlantis. The RSS provides protected access to the orbiter for changeout and servicing of payloads at the pad and then is rolled away before liftoff. Atlantis is poised for launch on mission STS-115. During the mission, Atlantis' astronauts will deliver and install the 17.5-ton, bus-sized P3/P4 integrated truss segment on the station. The girder-like truss includes a set of giant solar arrays, batteries and associated electronics and will provide one-fourth of the total power-generation capability for the completed station.
Photo credit: NASA/George Shelton
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