Even if you don't know it by name, the red supergiant star Betelgeuse is one of the most familiar sights in the heavens abovea gleaming ruddy dot at the shoulder of the constellation Orion.Although already quite difficult to overlook, Betelgeuse has become even more eye-catching across the past few years because of major changes in its appearanceunexpected fluctuations in its brightness that remain poorly understood.
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