Red Supergiant Star Betelgeuse Was A Different Color Just 2,000 Years Ago


Today, it's on the brink of death: a huge, red ball of flame, glaring like a baleful, bloodshot eye before it winks out into a tiny pinprick of degenerate matter. But red supergiant Betelgeuse was not always this way. Once upon a time, the star was a main-sequence monster – a blue-white O-type star, the most massive stellar weight class, fusing hydrogen like it was going out of style. As it rea...

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