Question

what is a black hole​

Answer 1

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

Answer 2

A black hole is a region of spacetime exhibiting such strong gravitational effects that nothing—not even particles and electromagnetic radiation such as light—can escape from inside it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.