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Galactic Beacons Get Snuffed Out in a Cosmic Eyeblink

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Changing quasar

The hot accretion disk swirling into a supermassive black hole extends for trillions of kilometers. How could it suddenly shut down?

Credit: Jessica Rossierfor Quanta Magazine

Stephanie LaMassa did a double take. She was staring at two images on her computer screen, both of the same object—except they looked nothing alike.

From Quanta Magazine
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