The sun is approximately a sphere of radius 6963 105 km at, Ask an Expert

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The Sun is approximately a sphere of radius 6.963 105 km, at a mean distance a = 1.496 108 km from the Earth. The solar constant, the intensity of solar radiation at the outer edge of Earth's atmosphere, is 1370. W/m2. Assuming the Sun radiates as a blackbody, calculate its surface temperature.

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