NASA's STEREO spacecraft -- with measurements shown in red -- stepped in to observe Betelgeuse from its unique vantage point, revealing unexpected dimming by the star. The 2018 data point from ...

Betelgeuse has been a favorite among amateur astronomers for many years. However you pronounce it, its unexpected dimming draws even more attention to this red supergiant variable star in Orion.

10, 2020 shows the star Alpha Orionis, or Betelgeuse, a red supergiant ... uncertainties over those predictions as well as the size of the star and its expansive atmosphere.