Betelgeuse recovers from its 'Great Dimming' and shows signs of a hidden companion

Good news for Orion's famous giant: Betelgeuse has finally bounced back. New radio telescope observations reveal that the outer atmosphere of this massive red supergiant—an aged, bloated star nearing the end of its life—has fully recovered following its mysterious "Great Dimming" event back in 2019 and 2020.

Between 2021 and 2026, astronomers used powerful radio arrays to check on the star's temperature and density. They found that Betelgeuse's outer layers have returned to normal, though the boundary of its atmosphere sits slightly wider than it did a decade ago.

Even more exciting, the data offer fresh clues about a suspected companion star named Siwarha. This smaller, hotter neighbor orbits so closely that it actually plows right through Betelgeuse’s sprawling outer atmosphere.

While the companion itself wasn't seen directly, researchers noticed it is subtly reshaping Betelgeuse's shape as it moves. Much like a speeding boat leaving a wake behind it in a lake, this orbiting companion appears to be churning up the stellar gas right where the star's winds are born.