The final stage in the evolution of a red dwarf star is

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A red dwarf star is a star with a mass less than about half the mass of the Sun. Red dwarf stars are the most common type of star in the Milky Way galaxy. They are also the longest-lived stars, with some red dwarfs expected to live for trillions of years.Red dwarf stars spend most of their lives on the main sequence, fusing hydrogen into helium in their cores. However, once they exhaust the hydrogen in their cores, they begin to evolve off the main sequence. The final stage in the evolution of a red dwarf star is a star of pure helium that no longer generates energy by nuclear fusion. This type of star is known as a helium white dwarf.

The Final Stage in the Evolution of a Red Dwarf