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  • Astronomers Witness a Supermassive Black Hole Roaring to Life

    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. For the two decades before 2019, the galaxy was the same level of…