Is Betelgeuse Going Supernova In 2024 Or Not. The star betelgeuse might someday appear as a spectacular explosion in our sky, a supernova. Today, astronomers know that betelgeuse varies in brightness because it’s a dying, red supergiant star with a diameter some 700 times larger than our sun.

Was the dimming a signal that the explosion was imminent? How do we know when t.