betsymccall.net Lifelong Learning Astronomy Planets Smaller Objects from the Inner Solar System

There are several different types of objects in the inner solar system besides the terrestrial planets. The Asteroid Belt marks the demarcation point between the inner and outer solar system. While most asteroids are found there, they are really all over the place, and near-earth objects need to be monitored carefully lest their orbits point them on a collision course. I have also included comets here because they are only visible when they are lit up by the sun; their origins, of course, are in the outer solar system.

Asteroids

Asteroid - Wikipedia, the free encyclopedia

Asteroid Fact Sheet

Main Asteroid Belt

NASA's Dawn Mission: To Explore 'Dwarf Planet' Ceres And Massive Asteroid Vesta

Asteroid belt - Wikipedia, the free encyclopedia

Asteroid Belt

Asteroids, Asteroid, Asteroid Belt at SPACE.com

Asteroids Are former Comets

Comet - Wikipedia, the free encyclopedia

NASA - Comet

Halley's Comet - Wikipedia, the free encyclopedia