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Welcome to the authors’ website for The Cosmos: Astronomy in the New Millennium, Fourth Edition.

Here you will find chapter updates, the latest astronomical news, and links to further resources. To purchase the book or to request an examination copy, please visit the Cambridge University Press website. Instructors will also find further online resources there, such as chapter-by-chapter PowerPoints and password-protected solutions.


The background shows Comet Lovejoy (C/2011 W3) and the Laser Guide Star Facility at the ESO Very Large Telescope, Cerro Paranal, Chile. Credit: Gabriel Brammer (ESO and Williams College ’02). Link to movie here.

To navigate to the updates, follow the links below to each chapter:

1. A grand tour of the heavens
2. Light, matter and energy: powering the Universe
3. Light and telescopes: extending our senses
4. Observing the stars and planets: clockwork of the Universe
5. Gravitation and motion: the early history of astronomy
6. The terrestrial planets: Earth, Moon, and their relatives
7. The Jovian planets: windswept giants
8. Pluto, comets, and space debris
9. Our Solar System and others
10. Our star: the Sun
11. Stars: distant suns
12. How the stars shine: cosmic furnaces
13. The death of stars: recycling
14. Black holes: the end of space and time
15. The Milky Way: our home in the Universe
16. A Universe of galaxies
17. Quasars and active galaxies
18. Cosmology: the birth and life of the cosmos
19. In the beginning
20. Life in the Universe