FORBES: Betelgeuse’s Mystery Dimming Caused By A Star Spot A Hundred Times Larger Than The Sun, Say Scientists

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Star spots are common in giant stars, but not on this scale. However, it’s unlikely that Betelgeuse is about to undergo the biggest possible of changes. “The sudden fading of Betelgeuse does not mean it is going supernova,” said Professor Albert Zijlstra from The University of Manchester, one of the authors. “It is a supergiant star growing a super-sized star spot.”