
NASA’s asteroid deflection test had unexpected and puzzling outcome
Illustration showing NASA’s DART probe, upper right, on course to strike the asteroid Dimorphos, left, which orbits Didymos Steve Gribben/Johns Hopkins APL/NASA/AP/Alamy After NASA smashed a spacecraft into an asteroid, its orbit slowly but surely changed over the next month, and astronomers can’t explain why. In 2022, the Double Asteroid Redirection Test (DART) flew a…