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KENNEDY SPACE CENTER, FLA. -- On their way to the white room on Launch Pad 39B to enter Space Shuttle Discovery, Commander Mark Polansky (right) and Mission Specialist Nicholas Patrick are greeted by the closeout crew. The STS-116 mission crew practices for launch with a simulation of activities, from suit-up to countdown in the orbiter. The STS-116 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. Launch is scheduled for no earlier than Dec. 7. Photo credit: NASA/Amanda Diller