star classObservedMeasured or catalogued in the real sky, with its source cited.ModelPublished physics or a published model, applied as written.
Supergiant
A massive star in a late stage of life, tens of thousands to hundreds of thousands of times as luminous as the Sun, of luminosity class I. Red supergiants such as Betelgeuse are among the largest stars known; blue ones such as Rigel are among the brightest. Most end as supernovae within a few million years of forming.