Question

what is black whole?​

Answer 1

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A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.

Answer 2

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The black hole is region in space time where the gravity is so strong that nothing no particles and electronic radiation can escape from it.