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There is a video with John Baez and Philip Gibbs explaining why this is a common misconception. It's the same family of conceptual error, where things lining up just right allow incorrect conceptual reasoning to land at a correct answer shape, that allowed John Michell to work out the Schwarzschild radius of a star in the late 1700s. With the blackhole universe picture, causal boundaries and spacetime's evolution aren't properly accounted for once we step out of a static picture. Incidentally, the cosmic object we are more likely to be inside of is a white-hole. | ||