Uploaded May 2021 | Updated September 2026, 2 weeks ago

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In cosmology, we can use general relativity to map out several possible futures and pasts. Most have an infinite future, but a finite past. How can that be possible? Maybe it isn't.

Nick Lucid - Host/Writer/Editor/Animator
Vanessa R Bradley - Thumbnail
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Why Does Stuff Happen? Gradients!
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RELATED YOUTUBE VIDEOS

PBS Spacetime on this topic:
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Up and Atom on this topic:
youtu.be/9UfQb_-XAuY

Trace Dominguez on this topic:
youtu.be/BPzsczOmzZ4
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OTHER SOURCES

libraryofbabel.info
math.stackexchange.com/questions/36289/is-infinity-a-number
en.wikipedia.org/wiki/Hilbert%27s_paradox_of_the_Grand_Hotel
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LINKS TO COMMENTS

youtube.com/watch?v=Ga0TKrylnXY&lc=UgxNm9qSPlS5qVGf1Nl4AaABAg
youtube.com/watch?v=Ga0TKrylnXY&lc=Ugxjhk0TAM25KjGUbIJ4AaABAg

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IMAGE CREDITS

Big Bang Animation:
svs.gsfc.nasa.gov/12656
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TIME CODES

00:00 Cold Open
00:30 The Problem
01:26 What is Entropy?
02:02 Second Law of Thermodynamics
04:31 The Typing Monkey
05:17 Law of Truly Large Numbers
06:24 What is Infinity?
08:58 Infinite Future
09:38 Summary
11:09 Outro
11:38 Featured Comments