The stellar companion may help explain why the brightness of Betelgeuse, the red supergiant, is open to so much variation.

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V1298 Tau b, as the planet is called, is a proto-sub-Neptune. With an estimated mass around times our planet, it is smaller ...

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For over a hundred years, astronomers have puzzled over strange changes in the brightness and motion of Betelgeuse, the closest red supergiant to Earth. Located in the shoulder of Orion, this colossal ...