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

Name: Stars swell into giants when hydrogen is exhausted in their centers.
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When a star exhausts its hydrogen fuel in the core, fusion reactions cease and the core contracts and heats up. This causes hydrogen fusion to occur in a shell around the core, which increases the energy output of the star and causes it to expand and become a red giant.

Stars Swell into Giants When Hydrogen Is Exhausted in Their