Black Hole

A black hole is an astronomical body so compact that its gravity prevents anything, including light, from escaping. Albert Einstein's theory of general relativity predicts that a sufficiently compact mass will form a black hole.[4] The boundary of no escape is called the event horizon. In general relativity, a black hole's event horizon seals an object's fate but produces no locally detectable change when crossed.[5] General relativity also predicts that every black hole should have a central singularity, where the curvature of spacetime is infinite.

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Black hole - Wikipedia - https://en.wikipedia.org/wiki/Black_hole