Up Next
Back to Show
PBS Space Time
Is Pluto a Planet?
Season 5
Episode 33
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.
Support Provided By
16:30
There’s an extremely good chance that Earth once did have a ring system.
17:23
How is it possible to tell if a space rock will one day collide with the Earth?
15:58
Did you know that many of us have up to 4% neanderthal DNA?
19:39
Why are billions suddenly being pumped into fusion startups?
16:36
The universe should've collapsed after the Big Bang, but a light Higgs boson let us exist.
18:32
Dark matter has eluded us for many decades but we may be able to discover more now.
15:35
What do you get if you combine something that’s infinitely massive and negative infinitely massive?
16:35
Is there a limit to how much energy you can cram into, or pull out of one patch of space?
