NEAR-EARTH SPACE IS SWARMING WITH asteroids—nearly 30,000 of them—and the largest ones pose a risk to our planet, threatening us with a cosmic collision like the one that wiped out the dinosaurs 65 million years ago. But we’re not dinosaurs, and we can do something about space rocks, deflecting them before they do us any harm. On Sept. 26, NASA’s DART spacecraft collided with an asteroid 7 million miles away in a proof-of-concept mission to show deflection technology works.
LOCKED AND LOADED DART stands for Double Asteroid Redirection Test, and the 1,260-lb., 8.5-ft. craft was aimed at the 530-ft. asteroid Dimorphos, which orbits the larger, 2,560-ft. asteroid Didymos. Dimorphos makes one circuit around Didymos every 11 hr. 55 min. The goal of DART: smash into Dimorphos and see if it’s…