For decades after its discovery, Pluto was considered the ninth planet in our Solar System. In 2006, however, it was reclassified as a dwarf planet. The Dwarf Planet Pluto explains this change, the controversy surrounding it, and many other fascinating facts about Pluto. Learn about new discoveries, innovative technologies, and incredible explorations that have given us many answers to our questions about outer space. So come along on this incredible journey through Space!