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Aha:

The black hole information paradox results from the combination of quantum mechanics and general relativity. It suggests that physical information could “disappear” in a black hole, allowing many physical states to evolve into precisely the same state. This is a contentious subject since it violates a commonly assumed tenet of science—that in principle complete information about a physical system at one point in time should determine its state at any other time.[1]

Black hole information paradox — Wikipedia


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