Black holes leak energy when they eat plasma near the event horizon

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The magnetic fields around a black hole can change the speed and trajectory of nearby particles

NASA/D. Berry

Black holes could be a cosmological engine. When their magnetic fields disconnect and reconnect, they can accelerate plasma particles near the event horizon – the point beyond which nothing can escape a black hole’s gravitational pull. The finding could allow astronomers to better estimate the mass and spin of black holes.

We expect all black holes to spin, because they are formed out of a collection of matter that is also spinning before it condenses. And around a spinning black hole there …

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