What About Pluto? compares Pluto to other objects in the Solar System.
Students learn that astronomers classify objects according to their characteristics. Rocky and gaseous planets, moons, asteroids, comets, and Kuiper Belt objects (icy bodies that orbit the Sun beyond Neptune) are all compared and contrasted with Pluto. Students read how Pluto is no longer considered a planet since its reclassification in 2006. From this example, students learn that scientific knowledge and, therefore, classifications can shift as new evidence becomes available.
This book provides students with important information about the classification of Solar System objects.