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They are regions of the solar photosphere that appear darker with respect to the surrounding areas because of the lower temperature that characterizes them.

The photosphere has, on average, a temperature of about 6,000 degrees; the spots have a temperature of approximately 1,000 degrees less.

The sunspots are easily visible even with a modest telescope for the amateur, either with the projection method, collecting the image on a white screen located beyond the eyepiece, or with the direct method after having placed a filter.

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Maksutov (telescope)Tides