Andrew is a freelance space journalist with a focus on reporting on China's rapidly growing space sector. He began writing for Space.com in 2019 and writes for SpaceNews, IEEE Spectrum, National Geographic, Sky & Telescope, New Scientist and others. Andrew first caught the space bug when, as a youngster, he saw Voyager images of other worlds in our solar system for the first time. Away from space, Andrew enjoys trail running in the forests of Finland. You can follow him on Twitter @AJ_FI.
— the lowest section of a star's atmosphere and the layer visible to us — is rebuilding itself, according to observations. However, Betelgeuse's rhythmic, 400-day period of variation in its brightness has disappeared, although possibly temporarily. Astronomers have observed these regular brightness variations for almost 200 years to gauge changes in Betelgeuse.
The Betelgeuse explosion may have been caused by a convective plume, more than a million miles across, bubbling up from deep inside the star. The plume could have disrupted the regular convection cells that drove the previously regular pulsation. Artist's depictions of Betelgeuse at stages of its strange dimming event, accompanied by a graph showing the star's brightness.
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