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Asteroids can reach as large as Ceres, which is 940 km (about 583 miles) across. On the other hand, one of the smallest, discovered in 1991 and named 1991 BA, is only about 20 feet (6 meters) across. Nearly all asteroids are irregularly shaped, although a few are nearly spherical, such as Ceres.
The average distance between asteroids in the main belt is about 600,000 miles. Ceres, the largest and most massive, is 590 miles wide. It contains almost one-third of the total mass of all the asteroids.