Proving the Exstance and current theorums of the "black hole"

What if I told you the most powerful object in the universe was no bigger than a city? What if I told you it had enough power nothing could escape its grasp, even light? What is this, you ask. A black hole. (Asimov, 1-196) What is a black hole? A black hole is an old star that has run out of fuel. The pressure created by its fuel keeps the star from collapsing in on …

…so white holes only exist in the theory and math of a black hole, but not physically. (Website three) Where's the nearest black hole to us? There is strong evidence that there is a black hole in the center of our own Milky Way galaxy! Yes, that close, but don't worry because the time it takes for it to engulf our galaxy will be billions of years. So we have nothing to fear of. Yet...(