The final remnant of the evolution of a red giant star that has ejected a planetary nebula is a:

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When a red giant star ejects a planetary nebula, the remaining core collapses and becomes a white dwarf. This is the final stage of evolution for low to medium mass stars like our sun. Protostars are early stages of star formation, blue supergiants are massive and short-lived, and supernovae occur when a massive star undergoes a catastrophic explosion.

The Final Remnant of the Evolution of a Red Giant