noun
EXAMPLES FROM CORPUS
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A year later he published his three letters on sunspots.
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In one such list the Jesuit astronomer Christopher Scheiner is included for his discovery of the sunspots.
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It also shows a clear relationship with sunspot activity; by and large there are fewer sunspots when the Sun is bigger.
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Scientists are concerned that a special event, such as a sunspot or supernova might occur during this long period of communications blackout.
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Then he saw sunspots and described their variations.
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They are probably produced by variations in sunspot activity.
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They say that the concentrated magnetic fields in sunspots spread out all over the sun somewhat after the maximum of solar activity.