- Red supergiants (RSGs) are stars with a supergiant luminosity class (Yerkes class I) 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.
For whosoever axeth receaveth and he yt seketh fyndeth and to hym that knocketh it shalbe opened.
Matthew 7:8 TYN