Red supergiant
Videos
Red supergiants are stars with a supergiant luminosity class and a stellar classification K or M. They are the largest stars in the universe in terms of volume, although they are not the most massive
Fluid dynamics simulations of a red supergiant, with giant convection cells and puffy surface
Betelgeuse pulsating and showing spectral line profile changes (HST UV images)
Most red supergiants end their lives as a Type II supernova, such as SN2013ej at bottom left in a spiral arm of M74.
RSGC1, the first of several massive clusters found to contain multiple red supergiants.
Betelgeuse
Videos
Betelgeuse is a red supergiant star in the equatorial constellation of Orion. It is usually the tenth-brightest star in the night sky and, after Rigel, the second brightest in its constellation. It is
Red supergiant
…and a stellar classification K or M. They are the largest stars in the universe in terms of volume, although they are not the most massive or luminous. Betelgeuse and Antares A are the brightest and best known red supergiants (RSGs), indeed the only first magnitude red supergiant stars. Stars are classified as…
AAVSO V-band magnitude of Betelgeuse, between September 2016 and August 2023
Comparison of SPHERE images of Betelgeuse taken in January 2019 and December 2019, showing the changes in brightness and shape
Image showing Betelgeuse (top left) and the dense nebulae of the Orion molecular cloud complex (Rogelio Bernal Andreo)