PART I: EXPLORING THE SKY. 1. Here and Now. Where Are We? When Is Now? Why Study Astronomy? 2. A User's Guide to the Sky. The Stars. The Sky and Its Motion. 3. Cycles of the Sun and Moon. Cycles of the Sun. Astronomical Influences on Earth's Climate. The Changeable Moon. 4. The Origin of Modern Astronomy. Classical Astronomy. The Copernican Revolution. Planetary Motion. Galileo Galilei. Isaac Newton and Orbital Motion. 5. Light and Telescopes. Radiation: Information from Space. Telescopes. Observatories on Earth: Optical and Radio. Airborne and Space Observatories. Astronomical Instruments and Techniques. PART II: THE STARS. 6. Atoms and Spectra. Atoms. Interactions of Light and Matter. Understanding Spectra. 7. The Sun. The Solar Atmosphere. Solar Activity. Nuclear Fusion in the Sun. 8. The Family of Stars. Star Distances. Apparent Brightness, Intrinsic Brightness, and Luminosity. Stellar Spectra. Star Sizes. Star Masses--Binary Stars. A Census of the Stars. 9. The Formation and Structure of Stars. The Interstellar Medium. Making Stars from the Interstellar Medium. Young Stellar Objects and Protostellar Disks. Stellar Structure and Nuclear Fusion. Main-Sequence Stars. 10. The Deaths of Stars. Giant Stars. The Deaths of Lower-Main-Sequence Stars. The Evolution of Binary Systems. The Deaths of Massive Stars. 11. Neutron Stars and Black Holes. Neutron Stars. Black Holes. Compact Objects with Disks and Jets. PART III: THE UNIVERSE OF GALAXIES. 12. The Milky Way Galaxy. Discovery of the Galaxy. Structure of the Galaxy. Spiral Arms and Star Formation. The Nucleus of the Galaxy. Origin and History of the Milky Way Galaxy. 13. Galaxies: Normal and Active. The Family of Galaxies. Measuring the Properties of Galaxies. The Evolution of Galaxies. Active Galactic Nuclei. Supermassive Black Holes. 14. Modern Cosmology. Introduction to the Universe. The Big Bang Theory. Space and Time, Matter and Energy. Twenty-First-Century Cosmology. PART IV: THE SOLAR SYSTEM. 15. Origin of the Solar System and Extrasolar Planets. The Great Chain of Origins. A Survey of the Solar System. The Story of Planet Building. Planets Orbiting Other Stars. 16. Earth and Moon: Bases for Comparative Planetology. A Travel Guide to the Terrestrial Planets. Planet Earth. The Moon. 17. Mercury, Venus, and Mars. Mercury. Venus. Mars. 18. The Outer Solar System. A Travel Guide to the Outer Solar System. Jupiter. Saturn. Uranus. Neptune. Pluto and the Kuiper Belt. 19. Meteorites, Asteroids, and Comets. Meteoroids, Meteors, and Meteorites. Asteroids. Comets. Asteroid and Comet Impacts. PART V: LIFE. 20. Astrobiology: Life on Other Worlds. The Nature of Life. Life in the Universe. Intelligent Life in the Universe. Afterword. Appendix A Units and Astronomical Data. Appendix B Observing the Sky. Glossary. Answers to Even-Numbered Problems. Credits. Index.