If the "universe” contains everything that exists, what can be outside it? If the answer is "Things that don't exist”, then "multiverse” becomes an idea in the domain of psychology, not physics. (Frank Wilczek)

If the "universe” contains everything that exists, what can be outside it? If the answer is "Things that don't exist”, then "multiverse” becomes an idea in the domain of psychology, not physics.

Frank Wilczek

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answer domain everything idea outside physics psychology universe things multiverse

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