Amazingfacts

This hypothetical cosmic body acts in the exact opposite manner of a black hole. Instead of pulling in matter, a white hole expels it like a sort of cosmic exhaust valve, giving off serious amounts of energy. Some cosmologists theorize that a black hole in one universe might empty out through a white hole in another universe. In these theories, the black hole acts as a kind of tunnel -- instead of pulling in matter that collapses into a single point, the black hole shuttles the matter right through the tunnel and out the white hole on the other end . In other words, the matter that comes out of a white hole is the matter that fell into a black hole.