Nasa.gov - Asteroids, Meteors, & Meteorites

http://solarsystem.nasa.gov/planets/asteroids

​http://solarsystem.nasa.gov/planets/meteors

​4.  The structure and composition of the universe can be learned from studying stars and galaxies and their evolution. As a basis for understanding this concept:​​

• e.   Students know the appearance, general composition, relative position and size, and motion of objects in the solar system, including planets, planetary satellites, comets, and asteroids