The James Webb Space Telescope just gave us an unsettling update on asteroid 2024 YR4—nicknamed the "city-killer" for its size. Fresh observations show its odds of slamming into the moon in December 2032 have jumped to 4.3%. That’s still a long shot, but space rocks this big (roughly the size of a football field) don’t usually get this close to a direct hit.

Editor’s Note: A 4.3% chance might sound low, but in asteroid terms, that’s eyebrow-raising. If 2024 YR4 did hit the moon, it wouldn’t threaten Earth directly, but the spectacle (and potential debris) would be a stark reminder of how much we still have to learn about near-Earth objects. Plus, it’s a test run for how we’d handle a rock actually headed for us.