NASA has completed a key step of its “Double Asteroid Redirection Test” (DART), smashing a satellite roughly the size of a vending machine into a small moon that’s about half-a-mile in diameter. The moon, Dimorphos, is orbiting an even larger asteroid, Didymos, and while neither is in any danger of colliding with Earth, they’re good test cases to see whether us puny humans smashing them with technology can cause them to change course.
Image: NASA
