This focused, advanced undergraduate text provides broad coverage of astronomy and astrophysics with a strong emphasis on physics. Many researchers, faculty, and graduate students use this book as a reference. This text has an algebra and trigonometry prerequisite, but calculus is preferred. Features: "Concept Applications" are fully worked-out, in-chapter problems that focus on an important concept found within that chapter. "Key Equations and Concepts" neatly summarize the important equations and concepts found in each chapter. New to this edition: Many new problems have been added, most 3rd Edition problems remain. Physics Prelude serves as preview and preorganizer of the physics at a level appropriate to the book and the course. Reorganization of Part 3 Chapters on stellar evolution are now consecutive. Key new astronomical material further enhances the text. "Hale-Bopp Comet Update" has been added after Chapter 26.