What happens to the inert helium core after hydrogen fusion ceases centrally?
Answer
Gravity wins the initial battle, causing the core to begin contracting and heating up
The long-standing equilibrium of the Sun relies on the balance between the outward pressure generated by core nuclear fusion and the inward crushing force of gravity. When fusion stops in the very center because the hydrogen fuel is exhausted, this balance is broken. Gravity immediately gains the upper hand, forcing the inert helium core to contract under its own weight. This gravitational collapse results in a significant and rapid increase in the core's temperature and density, setting the stage for the next phase of stellar evolution.
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