Title: What is a planet?
Description: On August 24, 2006, a group of astronomers made a big announcement: Pluto could no longer be considered a planet. This book explains how advancements in technology have changed our understanding of the universe--and exactly how and why the number of planets in our solar system went from nine to eight.
Subjects: Pluto (Dwarf planet), Juvenile literature, Pluto (dwarf planet), Astronomy