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KENNEDY SPACE CENTER, FLA. -- In the Payload Hazardous Servicing Facility at NASA Kennedy Space Center, workers in clean room suits guide the New Horizons spacecraft toward the stand at left with the third stage, or upper booster, a Boeing STAR 48 solid-propellant kick motor. The launch vehicle for New Horizons is the Atlas V rocket, 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.