What occurs to a star when it exhausts the hydrogen in its core?
Answer
The star expands and cools into a red giant.
When a star runs out of core hydrogen, the internal equilibrium is lost. Gravity takes over, compressing the core and generating heat that ignites hydrogen fusion in the shell around the core. This process causes the outer layers of the star to expand and cool, transforming the star into a red giant or supergiant.
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