Sean Carroll on the nature of time

A common false dichotomy peddled by religious apologists is that either the universe had a beginning a finite time ago, or it went on infinitely in the past – which, they argue, is impossible. To me, this has always sounded like flat-Earth cosmology: if the Earth were flat, we'd have two options – it would either go on forever, or stop at a finite boundary.

But just as we learned there is a third option for Earth – that it is both finite and without a boundary – modern cosmology tells us that our understanding of time may be completely transformed with new advances in physics. In this 20-minute TED Talk, Caltech physicist Sean Carroll muses on the nature of time, and how new discoveries in physics may transform our understanding of it.

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