Fully updated by William Hartmann, this text retains a comparative approach to the principles of planetology, including organization by physical topic rather than by planet. This unique approach promotes an understanding of the unifying principles and processes that cause similarities and differences among the moon and planets. This edition features finding and photos from Mars Pathfinder, Global Surveyor, Hubble, and photos of Jupiter's atmosphere from the Galileo probe, new data on Pluto and other small bodies, and more! The text's unique math boxes give you the flexibility to teach planetary science at a descriptive level or at a moderately advanced level involving algebra and elementary calculus.