Question

what's black hole?...​

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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Black hole is an area in space that nothing, not even light, can escape from, because the force that pull objects in space towards each other(gravity) is so strong there.