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1. Why is a Sun-spot black although its temperature is over 4000 C ?

2. If the mass of the Sun decreases because of nuclear fusion, why don't we see the Sun decreasing in size ?

3. Why do space-craft not melt in the heat of the million degree corona?

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Why is a Sun-spot black although its temperature is over 4000K?
A sunspot is a dark area in the surface of the Sun which has a much lower temperature of around 4,000K-4,500K as compared to the surrounding surface, which is roughly at 6000K. Thus, in accordance with the Stephan's law of radiation, a sunspot emits significantly less radiation as ...

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