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what happen when most of the hydrogen in the core is fused into helium in the star core​

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Answer:

the star's outer stellar layers expand and the core shrinks. At this point, the star becomes a Subgiant Star. The star's outer layers continue to expand and the star brightens.

Answer:

When the core hydrogen is used up and no more nuclear fusion occurs, the star's outer stellar layers expand and the core shrinks. At this point, the star becomes a Subgiant Star . The star's outer layers continue to expand and the star brightens.

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