According to new research, at least 85% of 200,000 asteroids in the inner asteroid belt — the main source of Earth’s meteorites — originate from five or six large primordial planetesimals; the other 15% may also trace their origins to the same group of ancient bodies. This artist’s concept shows a young planetary system. Image credit: NASA / JPL-Caltech. The findings, published in the journal Nature Astronomy, provide a more robust...
