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PBS Space Time - Season 2019 Episode 30
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トレーラー | HD | 26:14 分 | astrophysics, science and technology
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.
ETC.
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