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KENNEDY SPACE CENTER, FLA. -- STS-120 Mission Specialist Doug Wheelock checks out the primary payload for the mission: the U.S. Node 2, another element to be added to the International Space Station. Wheelock and other crew members are familiarizing themselves with the payload. Node 2 will provide a passageway between three station science experiment facilities: the U.S. Destiny Laboratory, the Kibo Japanese Experiment Module, and the European Columbus Laboratory. STS-120 is targeted for launch on Sept. 7 with a crew of six, including Commander Pam Melroy, Pilot George Zamka, and Mission Specialist Mike Foreman. Photo credit: NASA/Kim Shiflett