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Here’s another picture I scanned from Cosmos magazine
Sunspots
Sunspots are cooler and less luminous than the rest of the sun because complex magnetic feilds prevent hot material from entering the area. In this image from the U.S. National Solar Observatory, the area arounf the spot appears granulated. Gas inside the star heats up and rises in columns of hot gas. Each granule can be more than 1,000 km across and usually lasts between eight and twenty minutes.