Stars swell into giants when hydrogen is exhausted in their centres.

Name: Stars swell into giants when hydrogen is exhausted in their centres.
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When hydrogen is exhausted in a star's core, the core contracts and heats up, causing hydrogen fusion to move to a shell around the core. This releases more energy and causes the outer layers of the star to expand and cool, turning the star into a red giant.

Stars Swell into Giants When Hydrogen Is Exhausted in Their