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The surface temperature of the sun is approx. 5,500 °C Heating power: The solar constant on earth is 4000/3 watts/m^2. Given the sun is 150Gm away the heat given off at the sun is the solar constant times the area covered, 4pi r-squared, (4e3/3)x4pi (150e9)^2= 377 e24 watts. This is a lot of heating power.

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