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26. X-rays that come from the vicinity of a black hole actually originate from. well inside the event horizon. its exact center, or singularity. relatively far away from the black hole, where matter is still relatively cool.just outside the event horizon, on the accretion disk.. The black hole modifies spacetime around it so much that particles and X-rays are created in the vacuum itself, just outside the event horizon. The X-rays are produced by vibrations of the black hole itself, and therefore they come from the event horizon, and not from inside the black hole.
The boundary of this region is known as the event horizon, and it is defined as the point where the escape velocity from the gravitational field is equal to the speed of light. The calculation of the radial distance to this boundary can become quite complicated when the black hole is rotating and/or is charged.