Credit: NASA, ESA, and E. Wheatley (STScI)

This four-panel graphic illustrates how the southern region of the rapidly evolving, bright red supergiant star Betelgeuse may have suddenly become fainter for several months during late 2019 and early 2020. In the first two panels, as seen in ultraviolet light with the Hubble Space Telescope, a bright, hot blob of plasma is ejected from the emergence of a huge convection cell on the star's surface. In panel three, the outflowing expelled gas rapidly expands outward. It cools to form an enormous cloud of obscuring dust grains. The final panel reveals the huge dust cloud blocking the light (as seen from Earth) from a quarter of the star's surface.

Provider: Space Telescope Science Institute

Image Source: https://hubblesite.org/contents/news-releases/2020/news-2020-44

Curator: STScI, Baltimore, MD, USA

Image Use Policy: http://hubblesite.org/copyright/