Is Pluto a Planet?
Season 5 Episode 33 | 14m 3s Video has closed captioning.
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.
Problems Playing Video? | Closed Captioning