Children's Literature: Unless you have not been reading the papers, you know that there has been a major controversy about whether Pluto should be considered a full-fledged planet or reclassified as a dwarf-planet. In this book Scott recaps a lot of the history of astronomy, including some of the great names and their discoveries?Ptolemy, Copernicus, Galileo, and Kepler?and notes that until 1781 the theory was that only six planets made up our solar system. That changed with more contemporary astronomers such as Herschel, Piazzi, Galle, Lowell, Tombaugh, and the discovery of Uranus, Neptune, Pluto and the asteroid belt. About two-thirds of the way through the text, Scott mentions Pluto's problems?because of its distance from the sun scientist's did not expect to find that Pluto had a rocky core, its orbit is unlike the other planets both in its shape and plane, and Pluto is very small. Scott mentions Pluto's moon Charon, but according to Ken Croswell's Ten Worlds, Pluto has three moons. She does mention the discovery of Eris and the controversy about it. One of the really interesting chapters is entitled "What is a Planet?" Apparently astronomers around the world had never settled on a definition, but now there are three classes of objects that orbit the sun?planets, dwarf planets, and small solar system bodies. The pictures are excellent and the captions provide additional information, as does the glossary and the page for additional readings and web sites. The detailed index will assist students working on reports.