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Sun spots are just cooler regions of the Sun's surface, so they appear darker. A simplistic answer is that they are just a darker hue of the normal colour of the Sun.

A more detailed answer is that they are all different, depending on the visual perceptual property and who the observer is - as all observers will see a different value depending on their spectral sensitivity.

See the related link of a sun spot, and draw your own conclusions.

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14y ago

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