Believe it not, Einstein originally thought the universe was static. It would take Alexander Friedmann to correct him. Here are the Friedmann equations, explained simply.
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VIDEO ANNOTATIONS/CARDS
What was the Big Bang?
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SOURCES
Einstein's Papers:
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Friedmann's Paper:
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Einstein's Biggest Blunder:
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AFFILIATE LINKS TO BOOK SOURCES
"Spacetime and Geometry"
by Sean Carroll
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"General Relativity"
by Robert Wald
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"Gravitation"
by Misner, Thorne, and Wheeler
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LINKS TO COMMENTS
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IMAGE/VIDEO CREDITS
Einstein Portraits:
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Hilbert Portrait:
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Friedmann Portrait:
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TIME CODES
00:00 Intro
00:17 Brief History of Cosmology
00:58 Friedmann Equations
03:24 Possible Futures of a Universe
06:05 Changes in the Scale Factor
09:51 Matter, Dark Matter, and Light
11:09 Dark Energy
12:41 Closing Thoughts
13:38 Featured Comment
![](https://i.ytimg.com/vi/DAVsNkozQa8/maxresdefault.jpg)