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GIGANTIC STAR UNDERGOING RAPID CHANGE—COULD EXPLODE SOON WOH G64, one of the largest red supergiants known, is undergoing an unusually fast transformation, hinting at an impending supernova. A red supergiant is an aging massive star that has exhausted its core hydrogen and expanded to enormous sizes while burning heavier elements. These stars are in their final evolutionary stage before undergoing a supernova, a massive explosion that scatters elements into space, seeding future stars and planets. Located 160,000 light-years away in the Large Magellanic Cloud, this colossal star has changed dramatically in just a few years—a blink in cosmic time. Scientists believe that the gravitational collapse could trigger a stellar explosion visible from Earth.