PBS Space Time

How We Know The Earth Is Ancient

Season 6 Episode 11 | 13m 38s Video has closed captioning.

In astronomy we talk about billions of years like it’s no big deal. But how can we be sure about timescales so far beyond the capacity for human intuition? Our discovery of what we now call deep time is very recent - as recent as our discovery of the true spatial vastness of our universe. And it came as scientists tried to measure the age of the Earth. What they found was shocking and humbling.

Aired: 04/10/20

Rating: NR

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Problems Playing Video? | Closed Captioning