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A black hole is a volume from which matter cannot escape. More formally, the coordinate speed of light at the event horizon - the boundary of a black hole - is zero, as measured by a sufficiently separated observer.

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You can make a black hole with only matter, but Hawking radiation involves the emission of both matter and antimatter. If a star made out of matter (including baryons) collapses into a black hole, and …
asked Jun 2 by Retracted