Black Holes
... seconds if the event horizon could expand that quickly. These giant, destructive, mysterious beasts are the most complex puzzles in the universe. It is even said that there is a major black whole in every galaxy. The evidence comes from optical and radio observations, which show a sharp rise in the velocities of stars or gas clouds orbiting the centers of galaxies. They also emit little to no radiation, therefore they are extremely hard to detect. Black holes are formed from the remains of supernovas, the explosion of energy from a super giant star. After a large star is formed and has existed for billions of years it may then evolve into a super giant star, or a very large red star. At the end of its existence, a supernova may occur that is so strong that the star is blown apart. This large of an explosion uses up the same amount of energy that our sun uses in its entire lifetime! There are several different types of black holes, named after the person that discovered that type; Schwarzchild, Reissner-Nordström, Kerr, and Kerr-Newman black holes. Schwarzchild black holes d...