Einstein Theory of Relativity from his own book

The Event Horizon of a black hole

is a name we give to the region of spacetime beyond which anything that drops into it can never come back out. Not even light itself. This is contrasted by a white hole, which literally pushes you away by spitting material at you. Credit: NASA

Cosmic Dance:

Creation of Supermassive Black Holes Evolution of two equal sized galaxies colliding and forming a massive cloud of gas that will collapse into black hole. Credit: Ohio State University

Parallel universes

Black Hole connected to a theoretical White Hole. - If the theoretical science is correct, there are an infinite number of universes with same situations and different outcomes, do you believe?