
Curious Kids: Why does it matter if Pluto is a planet or a dwarf planet?
"Comet," "star" and "planet" are category names that immediately tell you something important about what they describe.
SPACE.com invites experts in space exploration, science & technology to provide insightful commentary and informed perspective on news, current events, innovations, big ideas and ongoing research. Expert Voices includes Op-Ed analysis and opinion as well as interesting observations from the field and space exploration efforts around the world.
Related Topics: Expert Voices - Don Lincoln, Expert Voices - Leroy Chiao, Expert Voices - Paul Sutter, Expert Voices - Robert Lawrence Kuhn, Expert Voices - The Kavli Foundation