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Black hole

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A black hole is a region of spacetime from which nothing, not even light, can escape. The theory of general relativity predicts that a sufficiently compact mass will deform spacetime to form a black hole. Around a black hole there is a mathematically defined surface called an event horizon that marks the point of no return.

The book A Brief History of Time written by Stephen Hawking was subtitled From The Big Bang to Black Holes, referring to black holes.

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