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KENNEDY SPACE CENTER, FLA. -- Inside Discovery's opened payload bay, a worker installs a wiring modification called the "Station to Shuttle Power Transfer System," or SSPTS. The SSPTS allows the space shuttle to stay docked at the International Space Station longer by providing its power and preserving its consumables. Discovery is scheduled to fly on mission STS-122 to the International Space Station in the fall of 2007. Photo credit: NASA/Jack Pfaller