How To Go Faster Than Light Speed

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Nothing can travel faster than light — in a vacuum. But when light slows down, sometimes matter can blaze past that speed limit, creating a stunning glow called Cherenkov radiation. We can see this glow in a nuclear reactor as high-energy particles speed by. It offers us a window into a realm of the universe that is usually invisible to us.

Filmed at the J. J. Pickle Research Campus at the University of Texas at Austin

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0:00 A strange blue glow
1:24 How to slow light down
3:19 The right way to think about light
5:41 How to make a photonic boom
7:51 Who discovered this?
8:25 Why this matters
9:45 Extras!

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