What is the primary function of shell burning in a red giant?

Answer

It generates energy by fusing remaining hydrogen in the region surrounding the core

After the core hydrogen is consumed, the star initiates shell burning to continue generating energy. In this process, the hydrogen located in the shell surrounding the core begins to fuse. This shell burning produces the necessary energy to support the expansion of the star's outer layers while the core itself undergoes contraction.

What is the primary function of shell burning in a red giant?

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