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There are chapters on the discovery of Uranus, Neptune, and Pluto, the related discovery of the first asteroids, the grand tour of the Voyagers, the three planets themselves, the search for a tenth planet, and more.
This book was written in 1988, while Voyager 2 was en route to Neptune. A later paperback edition revises the hardcover's speculation with a description of the actual Neptune encounter.
The author also remembers the human touch. There is ample discussion of planet discoverers William Herschel, John Adams, Urban Le Verrier, and Clyde Tombaugh. We also learn about the memorable people they worked with (and sometimes against!)
The author likes to use sidebars, which are quite interesting and keep the main text from getting bogged down. The sidebar items include Herschel's astronomer sister, the discovery of the Grand Tour concept, the discovery of Pluto's moon Charon (written by discoverer James Christy), Galileo's unsuspecting observation of Neptune in 1613, the (not yet launched) Galileo and Cassini missions, and more. Tombaugh himself also tells of some of his experiences.
Ironically, one sidebar supports Pluto's status as a planet, but allows that if a second asteroid belt is discovered it might make sense to redesignate Pluto as an asteriod. Guess what happened a few years later...
Perhaps Littmann will revise the book again to include the discovery of the Kuiper Belt, the discoveries by the Hubble telescope, the latest speculation about Planet X, and more.
Highly recommended.
List price: $15.95 (that's 30% off!)