The concept of a black hole was validated in 1939 by J. Robert Oppenheimer and Hartland Snyder when working with Einstein’s theory of General Relativity. The first physical evidence suggesting the existence of black holes came in 1970 with the discovery of Cygnus X-1.
Actually, in 1783, geologist John Michell calculated that if the velocity required to escape the gravity of a star was greater than the speed of light, then even light would not be able to escape. He called such theoretical stars “invisible” or “dark” stars. We now call them black holes.
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