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2nd document

A black hole is an astronomical body so compact that its gravity prevents anything, including light, from escaping. Albert Einstein‘s theory of general relativity, which describes gravitation as the curvature of spacetime, predicts that any sufficiently compact mass will form a black hole.[4] The boundary of no escape is called the event horizon. In general relativity, crossing a black hole’s event horizon traps an object inside but produces no locally detectable change. General...