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Black holes


            
             Black holes are one of the more bizarre and intriguing predictions of .
             Surprisingly, there is now a great deal of observational .
             evidence that black holes do exist, both in binary star systems and at the center of most .
             galaxies, including our own. Although we are gaining more knowledge of black holes, .
             they still remain one of the strangest things anyone has ever heard of, and we may never .
             know what exactly one of these things are and can do. It is impossible to manufacture .
             black holes in a laboratory. The density of matter required is too great. In order to make a .
             black hole the size of a baseball, you would have to pack all the matter in and on the .
             Earth into a volume the size of a fist. Nature can make black holes, however. Matter .
             naturally collapses unless there is some other force to hold it up. The objects in a room .
             are kept from collapsing by electromagnetic forces. The gas in an active star is held up by .
             thermal pressure. However, once a star uses up its thermonuclear fuel, it starts to .
             collapse, and if there is enough mass to overcome other, microscopic forces, it collapses .
             into a black hole. According to Einstein's theory, if we could pack enough matter into a .
             small enough volume, the thing created inside will get so deep that the matter inside can .
             never escape. A circle of no return forms. Any matter that passes the point of no return .
             can no longer escape to the outside world. It necessarily keeps collapsing, moving .
             towards the center. It gets deeper and deeper until finally a hole is literally torn in the .
             fabric of spacetime: the density of matter at the center becomes essentially infinite. Thus, .
             what is meant by "a hole in the fabric of spacetime" is: a tiny region of space where the .
             known laws of physics break down. A black hole is a region of space so tightly packed .
             with matter, that nothing, not even light can escape. Hidden at its center is a tear in the .


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