NASA’s Double Asteroid Redirection Test (DART) successfully impacts its target, demonstrating the potential for future asteroid deflection and planetary defence. After ten months of flying in space, NASA’s spacecraft crashed directly into Dimorphos, a 160 metre moonlet orbiting the larger asteroid Didymos. More than a feat of precise guidance and navigation, the test was “a mission of unity with a real benefit for all humanity,” says NASA Administrator Bill Nelson.