The Sun’s sunspots are temporary phenomena, on the photospheres, caused by magnetic activity. With temperatures of 3000–4500 K, the contrast with the surrounding material at ± 5,780 K leaves them visible as dark spots

 
The Sun's sunspots are temporary phenomena, on the photospheres, caused by magnetic activity. With temperatures of 3000–4500 K, the contrast with the surrounding material at ± 5,780 K leaves them visible as dark spots

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