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NASA Associate Administrator for the Science Mission Directorate Thomas Zurbuchen, right, and other NASA leadership listen as Julianna Scheiman, director for civil satellite missions, SpaceX, center, gives a tour of the hanger where the Falcon 9 rocket and DART spacecraft are being readied for launch, Monday, Nov. 22, 2021, at Vandenberg Space Force Base in California. DART is the world’s first full-scale planetary defense test, demonstrating one method of asteroid deflection technology. The mission was built and is managed by the Johns Hopkins APL for NASA’s Planetary Defense Coordination Office.