The Asteroid Belt T he Asteroid Belt is an area between Mars and Jupiter where most of our Solar System's Asteroids exist. The belt is believed to be the result of a failed planet that never formed from the debri in the Solar Systems early evolution.
Asteroids range in size from a few miles in diameter to mere pebbles.
A steroids are basically solid rocks. More on Comets The largest Asteroid is Ceres, which is about 580 miles in diameter. Vesta is the second largest at 325 miles in diameter. This is followed by Pallas at 320 miles in diameter and Hygeia at 255 miles in diameter.