And for that matter, could our universe be inside a black hole?
To Earthlings gazing into space, our solar system appears to be surrounded by billions of stars in the Milky Way. But if we look even further out, would it be possible to find evidence that we were in something even more fantastic, like a black hole?
So we can rule out the possibility that a black hole swallowed Earth at some point in its history; it would have been obliterated in a fraction of a second, Khanna said. But there's another way Earth might have ended up in the belly of a black hole: It could have formed there. This theory, known as Schwarzschild cosmology, suggests that our universe now expands within a black hole that is part of a parent universe. In theory, this scenario would mean that universes can exist within universes, like Russian nesting dolls, and that traveling back through a black hole — a likely impossible feat, since light can't even make the reverse journey — would unlock unknown realms, Khanna said.
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