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No star will EVER convert ALL of the hydrogen to helium via nuclear fusion (the process that powers the star) because when the star is less than about 50% hydrogen, the helium gets in the way of the fusion reaction and the star begins to die out. The star will begin to shrink as the star's own gravity now is more powerful than the nuclear reaction, and the star will get more dense and will heat up.

If the internal temperature and pressure gets high enough, the star will begin fusing helium into even heavier elements, becoming a red giant.

The speed of this reaction depends on the original mass of the star.

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Q: How many years does it take a star with mass of the sun to convert its hydrogen to its core?
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