According to general relativity, what we experience as gravity is the curvature of spacetime around mass and energy. In a black hole, enough matter has been compressed into a small enough region to create an event horizon: a boundary beyond which every possible path through spacetime leads farther inward. Escaping would require traveling faster than light, so neither matter nor light can return once it crosses that horizon. The black hole itself is therefore dark; astronomers find it indirectly through the motion of nearby stars and gas, the light bent around it, and the radiation produced by matter before it falls in.
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