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PBS Space Time
What Happened Before the Big Bang?
Season 5
Episode 29
We define the Big Bang as the extremely hot, dense, rapidly expanding universe that is described by Einstein’s equations. That picture of the universe is very solid down to about a trillionth of a second after the supposed beginning of time. We can make good guesses down to about 10^-30th of a second. But before that?
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16:08
Here’s the story we like to tell about the beginning of the universe.