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.
Explains Pluto's reassignment on August 24, 2006, from planet to dwarf planet. Includes illustrations.
Content Note
Introduction --The wanderers -- Some early astronomers -- Ideas that work--and those that don't -- Pluto's problems -- Finding planets -- What is a planet?
The wanderers -- Some early astronomers -- Ideas that work-and those that don't -- Pluto's problems -- Finding planets -- What is a planet?