Black Holes 10

According to Schwarzchild, if, at that boundary, gravitational effects became infinite, nothing could escape. Even light could be trapped, if only because its wavelengths, stretched by the gravity, would become infinitely long. A black hole represents the ultimate triumph of gravity in its role as the regulator of a star's life cycle. When a massive star dies, gravity becomes so strong that the star cannot hold itself up. A black hole is most likely the end of the lives of massive stars; a dead star.
             Why is it called a black hole? For a long time, the term used to describe this was not a black hole, but a frozen star, or collapsar. Now, it is properly named black hole; black because no light could leave it, and it would be a hole because anything dropped in it could not get out. .
             How big are black holes? Black holes of all sizes may be so common that a region the size of solar system might contain several tiny ones. Black holes may range from ones no larger than an atomic particle to those equivalent in mass to millions of stars. Black holes come in all sizes, not just the 10-solar-mass regular size. Globular clusters may contain maxi-black holes, with masses of several hundred solar masses. Mini-black holes far smaller than stars may also exist. .
             How are black holes formed? Black holes may form when stars are so overwhelmed by the force of their own gravity that they cannot keep from collapsing. A .
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             collapsing star shrinks. If its core is massive enough, it keeps shrinking; the surface keeps collapsing until the entire star has shrunk to a point. Surrounding this point is a volume of space where the gravity is so strong that any light trying to escape to the outside world is sucked back to the central point. Nothing inside a black hole could communicate with the outside world; it would be cut off from our universe by the event horizon, the edge of the black hole. Imagine a star with a mass ten times that of the sun.