12:50
PBS Space Time
The Doomsday Argument
A simple statistical argument tells us that the doom of our species is much, much closer.
Is Pluto a Planet?
PBS Space Time explores the outer reaches of space, the craziness of astrophysics, the possibilities of sci-fi, and anything else you can think of beyond Planet Earth. Host Matt O'Dowd breaks down both the basic and incredibly complex sides of space and time.
Is Pluto a Planet?
Season 5 Episode 33 | 14m 3s | CC
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.
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