"The Essential Cosmic Perspective", by Bennett, Donahue, Schneider, Voit, available at Textbook Annex on Campus and perhaps at the Jeffery Amherst Bookshop. This textbook is one of the most readable of the variety of introductory textbooks on the market. In addition, the order of the chapters closely follows a sequence which develops the underlying theme of the course. The textbook website is here.


Houjun Mo
Astronomy 100