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Multiple universes are accessed, in fiction, through portals in space or mystical necklaces or sometimes just in dreams, but always when characters break the rules of space time. In reality, alternate universes are not in other dimensions. They're just far, far away. And the reason they are alternate universes is that they can't be reached no matter what. But can they be tested for?
A work to be published in the Physical Review D posits a test, and some interesting conclusions, for multiverse theory. Multiple, or alternate, universes might, less excitingly, be called 'very far away places in this universe.' The universe is expanding, and has been since the Big Bang. As it expands, certain bubbles of it, also expanding, are pulled so far away so fast that their light can never reach this universe again. Essentially, they are parts of the universe that humans from this universe can never see…
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