Well, the only control is pressure. Stars of great mass can compress more material to fuse more rapidly. This is why, generally, the larger the star, the shorter it's life.
As more fusion takes place, this lowers the pressure on the core, and fusion slows down. If it slows way down, gravity takes over, and the pressure builds again.
The sun is an extremely stable star, in that it varies very little in it's output - the gravitational force holding it together is just about equal to the nuclear reaction trying to blast it apart.How does the pressure-temperature thermostat control the nuclear reactions inside stars?
i think its because the higher the pressure the harder it is for the particles to leave the sun so they bombard each other more and raise the temperature also the different atoms have different masses and fission/fuss-ion rates
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