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"extract": "In general relativity, the Oppenheimer\u2013Snyder model is a solution to the Einstein field equations based on the Schwarzschild metric describing the collapse of an object of extreme mass into a black hole. It is named after physicists J. Robert Oppenheimer and Hartland Snyder, who published it in 1939.",
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"extract": "A black hole is an astronomical body so compact that its gravity prevents anything, including light, from escaping. Albert Einstein\u0027s theory of general relativity, which describes gravitation as the curvature of spacetime, predicts that any sufficiently compact mass will form a black hole. The boundary of no escape is called the event horizon. In general relativity, crossing a black hole\u0027s event horizon traps an object inside but produces no locally detectable change. General relativity also predicts that every black hole should have a central singularity, where the curvature of spacetime is infinite.",
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"text": "J. Robert Oppenheimer and his student Hartland Snyder publish the Oppenheimer\u2013Snyder model, proving for the first time in contemporary physics how black holes could develop.",
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