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If Einstein's right, or if the general relativity is correct, then the universe is expanding, yes?
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Yes.
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So, if you reverse time, then the universe is getting smaller.
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Alright.
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So, what if I reverse the process all the way back to see what happened at the beginning of time itself?
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At the beginning of time itself?
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Yes. So the universe, getting smaller and smaller, getting denser and denser, hotter and hotter, as we're...
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We wind back the clock?
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-Exactly, wind back the clock! -Wind back the clock.
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Is that what you're doing? You're winding back the clock?
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That is what I'm doing!
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Oh, keep winding. I mean you got plenty of way to go! Keep winding!
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I don't want to fall in.
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Well, we gotta get back to the beginning of time, we got a long way to go, keep winding...
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until you get...
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A singularity.
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A space-time singularity. So the universe' born from a black hole exploding.
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Keep going.
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What do you mean keep going? What... before the universe began?
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No, no... keep going, develop the mathematics.