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<b>Pluto is not the first celestial body to get recategorized.</b> <a href="http://www.youtube.com/user/CGPGrey?feature=watch" target="_blank">CGP Grey</a> show us how the definition of "planet" has always been pretty sketchy.

Pluto is not the first celestial body to get recategorized. CGP Grey show us how the definition of "planet" has always been pretty sketchy.

A Convincing Argument To Ditch The Word "Planet"

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A Convincing Argument To Ditch The Word "Planet"

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A Convincing Argument To Ditch The Word "Planet"

View this video on YouTube

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