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flag A hidden star orbiting Betelgeuse creates a gas wake every 2,100 days, explaining its brightness changes.

flag Astronomers using Hubble and ground-based telescopes have found evidence of a hidden companion star, Siwarha, orbiting Betelgeuse and creating a repeating gas wake every 2,100 days, explaining the red supergiant’s long-term brightness changes. flag The companion, invisible in direct images, distorts Betelgeuse’s atmosphere like a boat through water, confirming a decades-old theory about the star’s irregular behavior, including its 2020 dimming. flag The findings, from nearly eight years of data, advance understanding of massive star evolution and binary interactions.

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