Another word for the Einstein-Rosen bridge is 'wormhole'. A wormhole is a hypothetical, theoretical, topological feature of spacetime that would be, fundamentally, a "shortcut" through spacetime. There's no actual evidence that they exist, but they're very close to the portal I've been through before, so there's a very real chance that perhaps this is what it really would be like and the theories were off somehow.
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wariscomingcom,