Is our universe all there is, or could there be more? Is our universe just one of a countless multitude, all together in an all-encompassing multiverse?
And if there are other universes, what would they be like? Could they be habitable?
This might feel like speculation heaped upon speculation, but it's not as crazy as you might think.
My colleagues and I have been exploring what other parts of the multiverse might be like—and what these hypothetical neighboring universes can tell us about the conditions that make life possible, and how they arise.
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