The stunning realization that there may be multiple universes has progressed from speculative metaphysics (or science fiction) to serious theoretical cosmology to data-rich...
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Multiverse: Where Do We Go from Here? (Part 2)
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Our universe is incredibly huge—billions of galaxies, each with billions of stars and planets—but the entire ‘multiverse’, multiple universes, may be staggeringly more immense. It stops your breath.