All this time, it turns out that we may just be living inside a black hole. Physicist Nikodem Poplawski of Indiana University posited that inside each black hole there could exist another universe:
"Maybe the huge black holes at the center of the Milky Way and other galaxies are bridges to different universes," Poplawski says. If that is correct – and it’s a big "if" – there is nothing to rule out our universe itself being inside a black hole. [...]
How would we know if we are living inside a black hole? Well, a spinning black hole would have imparted some spin to the space-time inside it, and this should show up as a "preferred direction" in our universe, says Poplawski. Such a preferred direction would result in the violation of a property of space-time called Lorentz symmetry, which links space and time. It has been suggested that such a violation could be responsible for the observed oscillations of neutrinos from one type to another.
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