Betelgeuse star dimming puzzle solved by chance with weather satellite

The sudden dimming of Betelgeuse in 2019 has been puzzling astronomers ever since, but now we have nailed down the cause

Space 30 May 2022

https://www.jma.go.jp/jma/jma-eng/satellite/index.html Artist?s impression of Himawari-8 and Himawari-9

Artist’s impression of Himawari-8 and Himawari-9

JMA

A weather satellite making routine observations of Earth may have solved the mystery of why the star Betelgeuse briefly lost its shine.

In late 2019, the red supergiant star, which is about 550 light years from Earth, suddenly became a lot fainter, an event known as the Great Dimming.

Previous research had suggested a cloud of dust and a cool spot on the star may have been the cause. Daisuke Taniguchi at the University of Tokyo, Japan, now believes we know for sure …

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