English: 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. Photo Credit: (NASA/Bill Ingalls)