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PBS Space Time
How Do We Know What Stars Are Made Of?
Season 6
Episode 26
Pin-pricks in the celestial sphere, through which shines the light of heaven? Or gods and heroes looking down from their constellations? Or lights kindled above middle earth by Varda Elbereth and brightened with the dew of the trees of Valinor? Science has long pondered the mysteries of the stars. This is how we finally figured them out.
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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?

16:35
What if the Big Bang was just an endless cycle?

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.

14:30
Maybe dark energy doesn't 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?

13:39
What does an electron really look like?

16:35
Is there a limit to how much energy you can cram into, or pull out of one patch of space?

17:19
I’d like to invite you to an even higher level of nerdom!

11:43
Gravitational tsunamis exist and we’re on the verge of being able to detect them.