Ars TechnicJ
Over the last couple of years, Ars has dedicated a fair number of electrons to our local red supergiant, Betelgeuse. The massive star went through an odd uneven dimming, leaving the astronomy community scrambling for explanations and observation time. While a degree of consensus slowly emerged, the lack of some key details left a lot unexplained.
It turns out that some of the answers were accidentally captured by an Earth-facing Japanese weather satellite that had Betelgeuse in-frame across the entire process of its dimming.