Multiple universes? The idea sounds astounding. Our universe is immense by itself. How could there be more than one? How can scientists come to believe in more than one universe? What’s more, multiple universes can be generated by radically different mechanisms. But what’s a ‘universe’ anyway? The whole vast ensemble of universes is now called a ‘multiverse’.
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Alexander Vilenkin is a Professor of Physics and Director of the Institute of Cosmology at Tufts University.
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