Tags: Star.
Red supergiants (RSGs) are supergiant stars (luminosity class I) of spectral type K or M. They are the largest stars in the universe in terms of volume although they are not the most massive. Betelgeuse and Antares are the best known examples of a red supergiant.After the hydrogen in a star’s core has fused stars with more than about 10 solar masses become red supergiants for the duration of their helium-fusing phase.
