“Here’s a ‘multiverse’ that basically everyone believes in,” says David Wallace, a philosopher and advocate of the many-worlds interpretation. “Think about the planets of the stars of distant galaxies. Pretty much everyone thinks that there are indeed planets around the stars in distant galaxies, and that there are rocks on the surface of those planets. … That’s not an infinite multiverse, but [ten thousand billion billion] solar systems is quite a lot to be getting on with. And the reason you take that seriously is not really because we can observe it. … It’s more that it’s a completely
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Interesting
