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Most likely, that will be helium fusion. This is expected to occur when most of the hydrogen in the core has burnt out, and the Sun has expanded into a red giant. The core will then contract, its own weight no longer supported by hydrogen fusion, until the temperature and density has reached sufficient levels to initiate helium fusion. It is expected that the helium fusion will proceed at an initially uncontrolled rate, producing a helium flash. The sun probably has not enough mass to also reach critical levels required for carbon fusion, which would be the next stage in more massive stars.

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