Look to the stars.

Although Astronomy has been around for more than 5,500 years, astronomers say that we've learned more than 90% of what we know about the universe in just the last 50—and much of that in the last decade! The Complete Idiot's Guide® to Astronomy, Fourth Edition, continues to be the most comprehensive introduction to the topic, covering all the latest advances and discoveries, including:

• The demotion of Pluto and promotion of Ceres as planetary objects

• Breakthrough evidence of recent water flow on Mars

• New developments in asteroid-tracking programs

• New information on the nature and shape of our universe

• Mind-bending theories concerning multiple universes

• Information on the latest telescopes

As a bonus, this book includes a fascinating CDROM with more than 200 of the most spectacular images from NASA, star maps, and other tools for backyard astronomers.