Curious Kids: Why does it matter if Pluto is a planet or a dwarf planet? - Space.com

"Comet," "star" and "planet" are category names that immediately tell you something important about what they describe.

This article was originally published at The Conversation. (opens in new tab) The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights. Samantha Lawler (opens in ne… [+5221 chars]

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