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KENNEDY SPACE CENTER, FLA. - Inside NASA Kennedy Space Center’s Payload Hazardous Servicing Facility, workers push the newly arrived third stage, or upper stage for the New Horizons spacecraft, into position for uncovering. The third stage is a Boeing STAR 48 solid-propellant kick motor. The Atlas V is the launch vehicle for NASA’s New Horizons spacecraft, scheduled to launch from Cape Canaveral Air Force Station, Fla., during a 35-day window that opens Jan. 11 and fly through the Pluto system as early as summer 2015. New Horizons will be powered by a single radioisotope thermoelectric generator (RTG), provided by the Department of Energy, which will be installed shortly before launch.