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Sunlight Is Way Older Than You Think. Here’s Why…

Season 8 Episode 4 | 8m 23s

If the sun instantly switched off like a light bulb–which can’t happen, by the way–then we wouldn’t know for almost 8 and a half minutes. Light travels at the fastest speed there is, but it still takes almost 500 seconds to get to Earth. But the most amazing thing about the sunlight we see is it’s actually SUPER old. How is that possible? Because of the physics and mathematics of random walks.

Aired: 03/02/20
Extras
Grantchester Season 10 premieres Sunday, June 15, 9/8c on MASTERPIECE on PBS.
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Ummat Somjee goes to Thailand to observe the cultural tradition of fighting beetles.
An intimate portrayal of three families confronting the unique challenges of Alzheimer’s.
Gavin Svenson heads to the Brazilian rainforest to sample the diversity of mantises.
Dragonfly expert Jessica Ware heads to Guyuna to sample dragonfly diversity.
Nancy’s wedding plans take a surprising turn. Sister Catherine takes her First Vows.
David Henry Hwang (Daniel Dae Kim) brings Marcus G. (Ryan Eggold) to a talkback.
David Henry Hwang (Daniel Dae Kim) shares a phone call with his father.
Forensic science is put to the test after the first-ever staged multi-vehicle pileup.
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