dark patches appears on the surface of the earth is called
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Sunspots are darker, cooler areas on the surface of the sun in a region called the photosphere. ... Sunspots have temperatures of about 3,800 degrees K. They look dark only in comparison with the brighter and hotter regions of the photosphere around them. Sunspots can be very large, up to 50,000 kilometers in diameter.01-Mar-2012
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