There are thousands of known asteroids, and many unknown asteroids as well. Between Mars and Jupiter lies the Asteroid Belt. There, thousands of rocks orbit the Sun. Asteroids are sometimes referred to as minor planets or planetoids. Comets are a mixture of ice, water and frozen gases.
Comets have three distinct parts, the nuculeus, coma, and the ion tail.
Comets also orbit the Sun. Bibliography and Additional Sources of Information Welcome to the Planets.