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Home Artist’s concept of a near-Earth object. (NASA/JPL-Caltech) Artist's concept of a near-Earth object. (NASA/JPL-Caltech)

Artist’s concept of a near-Earth object. (NASA/JPL-Caltech)

Artist's concept of a near-Earth object. (NASA/JPL-Caltech)

Artist’s concept of a near-Earth object. (NASA/JPL-Caltech)

NASA Planetary Defense Officer Lindley Johnson was among speakers at an Oct. 25, 2016, NASA/FEMA tabletop exercise in El Segundo, California, simulating emergency response to a hypothetical future asteroid impact. Regular exercises like this facilitate a strong working relationship between the asteroid science community and emergency managers. (The Aerospace Corporation)