Acknowledgments.
1 The Planet in the Cornfield.
2 Fellow Wanderers.
3 The Search for Planet X.
4 Pluto and Its Little Pals.
5 The Meaning of a Moon.
6 There Goes the Neighborhood.
7 Not Yet Explored.
8 Betting on the Tenth Planet.
9 The Battle of Prague.
10 The Lighter Side of Pluto.
1 1 The Great Planet Debate.
12 The Day of the Dwarfs.
13 Planet X Redux.
14 Alien Plutos.
15 The Case for Pluto.
Appendix A. What to Tell Your Kids about Planets.
Appendix B. The International Astronomical Union's Resolutions and Revisions.
Appendix C. Planetary Vital Statistics.
Notes.
Selected Bibliography.
Credits.
Index.