Welcome to the Web site for Is Pluto a Planet? (Princeton University Press, 2006). On this site you can learn more about the author and find additional references and resources on the topic.

The way we define planets within our solar system is continually changing as scientists constantly discover new objects in space. Pluto has gained attention recently as it was demoted to "dwarf planet", but scientists have been debating its status since it was discovered in 1930.  Is Pluto a Planet? doesn't just answer that question.  Instead it guides readers through the history of the solar system.  Readers learn what the word "planet" really means and how that meaning has changed as people have continued to make new discoveries in astronomy.   David Weintraub gives readers the information they need to understand the science surrounding Pluto and find their own answers.