Transcript: There are many types of interplanetary bodies, and they contain important clues as to the formation and evolution of the solar system. Interplanetary bodies range in size from 1,000 kilometers to chunks of rock the size of a house and smaller. They range in composition from icy to rocky to metallic. They range in distance from 50 to 100,000 astronomical units, or a 100,000 times the distance of the Earth from the Sun, to orbits that plunge inside the Earth's orbit and sometimes into the Sun itself. The largest of these objects are icy comets and rocky and metallic asteroids.