On Sept. 26, 2022, at 7:14 pm EDT, NASA’s DART (Double Asteroid Redirection Test) spacecraft slammed into an asteroid moonlet called Dimorphos, which orbits around a larger asteroid named Didymos. Dimorphos, roughly 163 meters in diameter, was not threatening anything. It was minding its own business, circling Didymos, when a spacecraft from Earth, roughly the…