https://www.universetoday.com/157533/just-2000-years-ago-betelgeuse-was-yellow-not-red/
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9/9/22 at 10:58pm
Organization
Universe Today
Author
Carolyn Collins Petersen
The red supergiant star Betelgeuse changed color so rapidly that astronomers in antiquity saw it as white-yellow. What happened to it?
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