For a few brief nights each year, you get a rare chance to watch a monster blink. The Event Horizon Telescope collaboration has released new, detailed views of M87*, the supermassive black hole at the heart of the galaxy M87. The images do not just show a glowing ring. They also track polarized light, a clue that reveals how magnetic fields behave near the edge of the black hole. Researchers from the University of Waterloo and the Perimeter Institute for Theoretical Physics helped construct and validate the images. What they found is both steady and startling. The size of the ring stays consistent over time. Yet the polarization pattern, the “fingerprint” of magnetism, changes sharply from year to year. That shift suggests a turbulent environment close to the event horizon. It also raises a simple question that is proving hard to answer: why did the magnetic signal fade, then flip? New images from the Event Horizon Telescope (EHT) collaboration have revealed a dynamic environment with changing polarization patterns in the magnetic fields of supermassive black …