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The Joe Rogan Experience

#2217 - Brian Cox

5680.131 - 5703.6 Brian Cox

Yeah. And we've inferred it. So you might say, how do you know it's there? You know, which is a good question, right? I mean, if we have not detected this stuff, how do you know? And it's from Einstein's theory, really. So it's from gravity. It's from looking at the way that galaxies rotate and the way that these sound waves move through the early universe and the way that the universe expands.

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