Hawking radiation

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What Wikipedia says

Hawking radiation is radiation released outside a black hole's event horizon due to quantum effects according to a model developed by Stephen Hawking in 1974. This black-body radiation was not predicted by previous models which assumed that once electromagnetic radiation is inside the event horizon, it cannot escape.

Excerpt from the Wikipedia article “Hawking radiation”, under the CC BY-SA 4.0 license. Read the article on Wikipedia