Modern telescopes allow us to see a universe billions of light years across, with trillions of galaxies. But we believe that what we can see is only a tiny fraction of all that is out there. Might there be distant regions that look very different from what we see? Might there be entire other universes with different types of matter, or even seemingly different laws of nature? Although such ideas sound like science fiction, you’ll see that many of our theories and discoveries have led scientists to the idea that the universe as we know it might be part of a much bigger realm, sometimes called a “multiverse.”
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