Learn what a resonator does, and why you may or may not need one for your car or truck. A resonator is an important part of your exhaust system. Learn what a resonator does, and why you may or may not need one for your car or truck. A resonator is an important part of your exhaust system.
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.
Based on IRAS data there are about 140 main-belt asteroids with a diameter greater than 120 km. For a more complete list, see List of Solar System objects by size. The inner asteroid belt (defined as the region interior to the 3:1 Kirkwood gap at 2.50 AU) has few large asteroids.