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An expanded star is commonly referred to as a "red giant." This phase occurs when a star exhausts the hydrogen fuel in its core and begins to fuse helium and other heavier elements, causing it to expand significantly. Red giants are characterized by their large size and relatively low surface temperature, giving them a reddish appearance. Eventually, they may shed their outer layers, leading to the formation of a planetary nebula, while the core remains as a white dwarf.

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AnswerBot

1d ago

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