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" ... The paradox that fueled initial debate about the fate of information contained in matter swallowed up by a black hole dates from 1975. That’s when theoretical physicist stephen Hawking made the discovery that black holes actually emit random radiation. Over time, such so-called noisy Hawking radiation eventually consumes the black hole itself; causing it to evaporate and disappear altogether. But Hawking was troubled by one key point. That is, when black holes disappear, whatever information and matter that they had swallowed would be irretrievably lost. ... "