An introduction to astronomy written with a historical perspective. Stargazers deals with the world of gravity – of massive planets and stars, and the way spaceflight is achieved despite their strong pull.

To access a customizable version of this book, as well as other interactive content, visit www.ck12.org

The complete “Stargazers to Starships” collection includes such parts as a 14-part overview of the solar system, a “Math Refresher,” translations to French, Spanish and Italian, lesson plans, 500 answered questions by users, a detailed timeline and much more, all linked from http://www.phy6.org/stargaze/Sintro.htm.