How We Know The Earth Is Ancient

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.

More Episodes

The Arrow of Time and How to Reverse It

It's time to begin our journey towards really understanding time.

Can Free Will be Saved in a Deterministic Universe?

Space Time weigh in on physics and free will.

Electroweak Theory and the Origin of the Fundamental Forces

We explore how forces of nature, once unified, were forced to separate.

Other Shows You May Enjoy