Is Earth's Fate Sealed by an Approaching Black Hole?

Earth could not have been swallowed by a black hole due to the catastrophic gravitational pull, but it could have formed within one. The theory of Schwarzschild cosmology suggests that our universe now expands within a black hole that is part of a parent universe. However, this theory is unlikely to be proven as nothing can travel back across a black hole's event horizon. If Earth existed in a black hole, it must be enormous, universe-size, and so vast that we can't travel far enough or fast enough to detect the gravitational distortions.