Aspects of this topic are discussed in the following places at Britannica.
About 30 asteroids are larger than 200 km. The largest, Ceres, has a diameter of about 940 km. It is followed by Pallas at 530 km, Vesta at 520 km, and (10) Hygiea at 410 km. Three asteroids are between 300 and 400 km in diameter, and about 23 between 200 and 300 km. It has been estimated that 250 asteroids are larger than 100 km in diameter and perhaps a million are larger than 1 km. The...
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