CfA astronomers Morgan MacLeod, Caroline Huang, Andrea Dupree, and Avi Loeb just presented a new explanation for Betelgeuse's Great Dimming of early 2020. They think that the outburst was caused by a particularly hot, energetic convective plume bursting out of the star's boiling surface, and simulated the process in a new paper https://arxiv.org/abs/2305.09732.

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