A cool, highly luminous evolved massive star with an extended envelope, generally later than its initial hot main sequence stage. Its eventual core-collapse outcome depends on the core, winds, mixing and binary history, not on its red colour alone.
A red supergiant is a type of large star that has reached an advanced stage in its stellar evolution. These stars are characterized by their enormous size, high luminosity, and reddish color. Here are some key features of red supergiants: 1. **Size and Luminosity**: Red supergiants are among the largest stars in the universe, with diameters that can be hundreds of times greater than that of the Sun.
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