main asteroid belt
The belt appears to have originated as a system of perhaps 50 large bodies in the 100 to 1,000 km size range. These accreted during the formation of the Solar System and thereafter suffered collisions leading to fragmentation. This hypothesis suggests that only a few of the larger asteroids are still intact.
Beyond the orbit of Neptune lies an even large and more populous region of minor bodies known as the Kuiper belt.
Related category ASTEROIDS AND OTHER MINOR PLANETS: TYPES AND GROUPS
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