Did you know that there are five known dwarf planets? They are called Ceres, Pluto, Haumea, Makemake, and Eris. Find out more in Dwarf Planets, a Planets book. This is an AV2 media enhanced book. A unique book code printed on page 2 unlocks multimedia content. This book comes alive with embedded weblinks, audio and video clips, activities, and other features, such as a slide show, matching word activity, and quiz.