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

This report-starter series examines seven wonders of outer space--wonders beyond our solar system; asteroids, meteors, and comets; the gas giants; mysteries of

Chronicles the formation of the solar system, particularly how asteroids, comets, and meteors were formed, and relates how astronomers learn about the existence

Spectacular NASA photos and illustrations inspire readers to explore the wonders of asteroids, comets, and meteors.