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CAPE CANAVERAL, Fla. –– The Centaur upper stage arrives at the Vertical Integration Facility near Cape Canaveral Air Force Station's Launch Complex 41, where it will be lifted onto the Atlas V first stage, already in the tower. The Atlas V/Centaur is the launch vehicle for NASA's Lunar Reconnaissance Orbiter, or LRO, and NASA's Lunar CRater Observation and Sensing Satellite, known as LCROSS. LCROSS and LRO are the first missions in NASA's plan to return humans to the moon and begin establishing a lunar outpost by 2020. Photo credit: NASA/Jack Pfaller