Our matryoshka universe

Every black hole contains another universe? It’s possible that our universe is actually sitting inside the black hole of another universe and the black holes in our universe may lead to 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.