Betelgeuse: The Supernova That Wasn't

The trajectory of Betelgeuse’s stellar “sneeze” in late 2019 and early 2020: First, the supergiant star spewed hot gas into its atmosphere, which then cooled, forming a dark cloud. The last panel, as seen from Earth, shows the cloud blocking the star’s light. (Credit: NASA, ESA, and E. Wheatley(STSCI))