Bodies in this structure are classified as C-type, S-type, and M-type based on composition. Objects 
Bodies in this structure are classified as C-type, S-type, and M-type based on composition. Objects in this region are perturbed by thermal photons in the Yarkovsky effect. The outer edges of this region contain D-type objects, which according to the Nice model were captured during the late heavy bombardment. Objects in this region are sorted into Hirayama families based on clumps in a proper inclination vs eccentricity plot. The frost line is found within this region, which contains a series of features created by (*) 4:1 and 5:2 resonances with a nearby massive body; those are Kirkwood gaps. This region contains Vesta, Ceres, and Pallas. For 10 points, name this region between the orbits of Mars and Jupiter, which is filled with space rocks.
Bodies in this structure are classified as C-type, S-type, and M-type based on composition.
main asteroid belt [prompt on "asteroid" or "asteroid field"]