"Once you cross the threshold to form a black hole, everything inside the event horizon crunches down to a singularity that is, at most, one-dimensional. No 3D structures can survive intact, although the potential for any infalling matter/energy to be transported into a "baby Universe" created on the other side of this black hole cannot be ruled out". (BigtThink.com/We can’t avoid a singularity inside every black hole) The problem with the black hole is that the time would start to travel backward inside the event horizon. The event horizon is the point, where time stops. And inside it, time starts to move backward. Which is against the linear time model. Time reverse breaks the golden order, that everything can happen only once. That thing makes the retrocausality possible. "Retrocausality, or backward causation, is a concept of cause and effect in which an effect precedes its cause in time and so a later event affects an earlier one." "In quantum...