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It's Confirmed. M87's Black Hole is Actually Spinning
The supermassive black hole at the heart of M87 was the target of the Event Horizon Telescope, revealing the area around its event horizon for the first time. Although an accretion disk surrounded the black hole, astronomers weren't sure if the black hole itself was rotating. They imaged the region with radio telescopes and discovered the remnants of polar jets, showing that the black hole's rotation axis had undergone precession over time. This precession indicates that the black hole is rotating; they're just not sure how quickly yet.
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