Key Points The supermassive black hole 1ES 1927+654 is located 100 million light-years away. Its corona disappeared in 2018, reformed, and has displayed unusual X-ray flashes. The flashes increased from 18-minute to seven-minute intervals over two years. A spinning white dwarf near the event horizon is the leading explanation for the phenomenon. Astronomers have been captivated by a supermassive black hole, 1ES 1927+654, located 100 million light-years away and exhibiting unprecedented phenomena. First noted in 2018, its corona—a plasma cloud...