Betelgeuse Dimming 2024 Calendar. Betelgeuse, a red supergiant in the constellation of orion, abruptly darkened in late 2019, early 2020. Observations by nasa’s hubble space telescope are showing that the unexpected dimming of the supergiant star betelgeuse was most likely caused by an.

Analyzing data from nasa’s hubble space telescope and several other observatories, astronomers have concluded that the bright red supergiant star. About a year before the great dimming, betelgeuse let out a giant belch of gas, releasing a cloud of hydrogen and other atoms.