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Astronomers Witness a Supermassive Black Hole Roaring to Life

Five years ago, a galaxy 300 million light-years away got a lot brighter in telescopes, radiating ultraviolet, optical, and infrared light out into space. This year, the resurgent galaxy started emitting X-rays, indicating that its initial brightening was really just a warmup.

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Astronomers Witness a Supermassive Black Hole Roaring to Life

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