🔬 Science 12h ago · Ethan Siegel

The information paradox at the heart of every black hole

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The information paradox at the heart of every black hole
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When something falls into a black hole, where does the material ultimately go, and will it, or the quantum information that it contained, ever come back out again? According to Einstein’s general relativity, those answers are simple: as soon as anything physical — matter, antimatter, radiation, etc. — crosses over the event horizon, it’s irretrievably gone. It can add to certain properties, like mass, electric charge, and angular momentum, that the black hole possesses, but little else. Instead,

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