Astronomers announced in January 2026 that they had found a 710-metre asteroid — nearly eight football fields across — spinning once every 1.88 minutes. A normal rubble-pile asteroid should tear itself apart at anything close to that speed, meaning 2025 MN45 must have internal strength comparable to solid rock.

Rubin Observatory measured a 710-metre main-belt asteroid turning once every 1.88 minutes, implying cohesion comparable to rock under the study's model. The post Astronomers announced in January 2026 that they had found a 710-metre asteroid — nearly eight football fields across — spinning once every 1.88 minutes. A normal rubble-pile asteroid should tear itself apart at anything close to that…