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Like part of a cosmic Russian doll, our universe may be nested inside a black hole that is itself part of a larger universe.
In turn, all the black holes found so far in our universe-from the microscopic to the supermassive-may be doorways into alternate realities.
According to a mind-bending new theory, a black hole is actually a tunnel between universes-a type of wormhole. The matter the black hole attracts doesn't collapse into a single point, as has been predicted, but rather gushes out a "white hole" at the other end of the black one, the theory goes.