PBS Space Time

Is Pluto a Planet?

Season 5 Episode 33 | 14m 3s

You know what a planet is, right? A big round thing that orbits a star. Uh, not so fast. The surprisingly vicious debate over the planetary status of Pluto has given us a fascinating glimpse into what a scientific definition really is. And perhaps the word planet is too vague to be used as a scientific definition at all.

Aired: 11/05/19

Rating: NR

Video has closed captioning.

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