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Black Holes Black holes are one of the more bizarre and intriguing predictions of Einsteins theory of gravity 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 Einsteins 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
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