The red supergiant star Betelgeuse, which dimmed significantly in 2019, has returned to normal, according to images from the European Southern Observatory. Astronomers from France’s Université Côte d’Azur suggest the dimming was due to a burst of dust, possibly caused by a sudden cooling of the star’s surface. This theory aligns with a 2021 study suggesting Betelgeuse expelled a gas bubble. The event indicates that dust, which can feed new star systems, can form close to stars.
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