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How We Know The Earth Is Ancient

Season 6 Episode 11 | 13m 38s

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: 04/06/20
Extras
All particles belong to two large groups: fermions and bosons.
Just how much stronger is this year’s solar activity going to get?
So you’ve decided to jump into a black hole...
We only recently figured out where cosmic rays are coming from.
Black hole complementarity may force us to rethink what it means to say that it exists.
To travel the stars without faster than light travel we’re going to need a generation ship.
Today we are jumping into a black hole. Again.
The Moon: humanity’s first destination beyond our atmosphere.
So how did humans figure out the solar system? Eclipses!
Is gravity just an emergent effect of entropy?
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All particles belong to two large groups: fermions and bosons.
Just how much stronger is this year’s solar activity going to get?
So you’ve decided to jump into a black hole...
We only recently figured out where cosmic rays are coming from.
Black hole complementarity may force us to rethink what it means to say that it exists.
To travel the stars without faster than light travel we’re going to need a generation ship.
Today we are jumping into a black hole. Again.
The Moon: humanity’s first destination beyond our atmosphere.
So how did humans figure out the solar system? Eclipses!
Is gravity just an emergent effect of entropy?