Our Sun will first become a red giant, then a white dwarf, and finally a brown dwarf.

Question

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After becoming a red giant, the Sun will eventually shed its outer layers to form a planetary nebula, leaving behind a core that will cool and fade as a white dwarf. It will not become a brown dwarf, as brown dwarfs are objects that are too massive to be considered planets but not massive enough to sustain nuclear fusion of hydrogen in their cores like stars.

Our Sun Will First Become a Red Giant, Then a White