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PBS Space Time
The Crisis in Cosmology
Season 5
Episode 9
The search for a single number: the hubble constant, which is the rate of expansion of our universe, has consumed astronomers for generations. Finally, two powerful and independent methods have refined its measurement to unprecedented precision. The only problem is that they don’t agree. This calls into question some of our most basic assumptions about the universe.
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There’s an extremely good chance that Earth once did have a ring system.
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How is it possible to tell if a space rock will one day collide with the Earth?
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Did you know that many of us have up to 4% neanderthal DNA?
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Why are billions suddenly being pumped into fusion startups?
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The universe should've collapsed after the Big Bang, but a light Higgs boson let us exist.
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Dark matter has eluded us for many decades but we may be able to discover more now.
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What do you get if you combine something that’s infinitely massive and negative infinitely massive?
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Is there a limit to how much energy you can cram into, or pull out of one patch of space?
