Stars with ˜0.4-4 solar masses swell into giants when hydrogen is exhausted in their centers.

Name: Stars with ˜0.4-4 solar masses swell into giants when hydrogen is exhausted in their centers.
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This is correct according to the standard theory of stellar evolution. When hydrogen is no longer available as fuel for nuclear fusion, the core of the star contracts and heats up, causing the outer layers to expand and cool, resulting in the star becoming a giant.