What are Sun spots?

What are Sun spots? Correct Answer Dark patches on the surface of the Sun resulting from a localised fall in the temperature to about 4000 K

A dark patch in the sun's photosphere resulting from a localized fall in temperature to about 4000 K. Most spots have a central very dark umbra surrounded by a lighter penumbra. Sunspots tend to occur in clusters and to last about two weeks.
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