Scientists discover 63 new young asteroid families—more than doubling the previous number

Young asteroids—which formed much later than those that were created during the formation of our solar system—are typically created when larger asteroids, planetesimals, or comets collide and break up into smaller pieces. These smaller pieces form "asteroid families" that share certain properties, like their semimajor axis, eccentricity, and inclination—all of which describe their orbital paths.

source https://phys.org/news/2025-09-scientists-young-asteroid-families-previous.html