Colossal Flare Could Be First Evidence Energy Can Be Extracted From Black Holes – ScienceAlert

The popular conception goes that nothing can escape from a black hole. Once something passes the event horizon – the so-called point of no return – it stays there, forever, bound by a gravitational field not even light can escape.
But a rotating black hole generates vast amounts of energy, which, theoretically, can be extracted from the ergosphere, a region that sits just on the outside of the event horizon. This has been shown both theoretically and experimentally – and now a team of astrophysicists…

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