What physical process causes a star like Eta Piscium to expand into a giant?
Answer
It has exhausted the hydrogen fuel in its core.
As a star exhausts its hydrogen supply, it moves past the stable main-sequence phase. This transition triggers structural changes, causing the outer layers of the star to cool and expand significantly. This process results in the classification of the star as a giant. During this stage, the star begins fusing heavier elements in its core, which allows it to maintain its luminosity despite the cooling of its outer surface.
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