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Described gravity in his publication of "Principia."
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John Michell conjectured that there might be an object massive enough to have an escape velocity greater than the speed of light in existence.
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A French mathematicion named Pierre Simon Laplace reasoned that if the corpuscular theory of light proposed by Isaac Newton were correct, there could exist massive objects from which light could not escape. "Black hole." The Gale Encyclopedia of Science. Ed. K. Lee Lerner and Brenda Wilmoth Lerner. 4th ed. Detroit: Gale, 2009. Science in Context. Web. 10 Dec. 2013.
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Predicted the existence of black holes following his theory of general relativity.
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Karl Schwarzchild used Einstein's Theory of General Relativity to define a black hole. Defined gravitational radius of black holes, later called the Schwarzchild radius. "Black Holes - History." Black Holes - History. N.p., n.d. Web. 11 Dec. 2013.
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Opposed Einstien's theory of blakc holes.
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John Wheeler coined the term, "black hole."
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Stephen Hawking defined modern theory of black holes, which describes the final fate of black holes.
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The Hubble Space Telescope probides the best evidence to date of massive black holes that lurck in the center of galaxies.
