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Discovery suggests red supergiant Betelgeuse was actually yellow 2,000 years ago

Using historical depictions and descriptions of Betelgeuse throughout the ages, scientists have been able to pinpoint roughly when the supergiant star got its red coloration.

The team found that the star, located in the Orion constellation in the Milky Way around 640 light-years from Earth, changed from a yellow-orange color to red approximately 2,000 years ago. Betelgeuse is a red giant star, a stage that stellar bodies go through when they finish burning hydrogen in their cores, resulting in the core collapsing and the outer layers of the star puffing out.

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