Question

what is black hole?​

Answer 1

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$<font color= "purple"><b>$A black hole is a region of spacetime exhibiting gravitational acceleration 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.
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Answer 2

Answer:

black hole is  hole which takes in everything

Explanation: