Question

How does a red giant become a white dwarf?

Answer 1

your answer is here

when the cross of red giant with any white dwarf.

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Answer 2

Answer:

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Explanation:

If a red giant has insufficient mass to generate the core temperatures required to fuse carbon (around 1 billion K), an inert mass of carbon and oxygen will build up at its center. After such a star sheds its outer layers and forms a planetary nebula, it will leave behind a core, which is the remnant white dwarf.