From earliest times, humans have wondered about the sky above them and have studied all visible objects. People began to identify differences between stars and

Describes in simple terms the meteors, comets, and asteroids that are part of our solar system and discusses the various theories concerning their origin and th

"Asteroids, comets, and other space rocks rush around the solar system. Learn about these fascinating flying masses and their place in the solar system."

Explores how comets, meteors, and asteroids move through our solar system, and explains the ingredients that make a comet's tail and other topics

Describes the role that collisions with meteors, comets, and asteroids have played in the history of Earth and other planets in the solar system and examines wh