NASA has published pictures showing corona discharge from a black hole. But how is it possible and if so how does this corona discharge happen. Please explain
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I would guess you are referring to this observation of a flare from a black hole.
(image is from the linked article and is an artists rendering of the flare)
The answer is that the X-rays are being generated by the hot gas falling into the black hole, not from within the black hole itself (which is of course impossible).
However the physics that controls how these flares evolve is not well understood. It remains an active area of study.
John Rennie
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