Solar Thermostat

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Solar Thermostat

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balances the Sun's fusion rate so that the amount of nuclear energy generated in the core equals the amount of energy radiated from the surface as sunlight. gravitational equilibrium and energy balance together act as a thermostat to keep the Sun's core temperature and fusion rate seady. So, if there is a slight drop in core tempterature, there is a large decrease in the fusion rate which lowers the core pressure. This lowering of the core pressure, in turn, causes the core to contract and heat up. In the same way, if there is a slight rise in core temperature, there is a large increase in the fusion rate whcih raises the core pressure, causing the core to expand and cool down.
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