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KENNEDY SPACE CENTER, FLA. -- The orbiter Discovery is ready to move out of Orbiter Processing Facility bay 3 and roll over to the Vehicle Assembly Building. First motion was at 9:23 p.m. Oct. 31. In the VAB the orbiter will be mated to its large external tank and twin solid rocket boosters already stacked on the mobile launcher platform. Space Shuttle Discovery is scheduled to roll out to Launch Pad 39B no earlier than Nov. 7 for mission STS-116. The mission is No. 20 to the International Space Station and construction flight 12A.1. The mission payload is the SPACEHAB module, the P5 integrated truss structure and other key components. The launch window for mission STS-116 opens Dec. 7. Photo credit: NASA/Kim Shiflett