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Sometimes areas of the Sun will suddenly appear much brighter. These bright spots are called solar flares. A sunspot is a cooler, and therefore darker, region of the Sun's photosphere caused by a solar magnetic disturbance.

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Sunspots are dark areas on the surface of the Sun that are cooler than surrounding areas. They appear in groups, vary in size, and cycle in number over an 11-year period. Solar flares are sudden eruptions of energy from a small area of the Sun's surface. They are extremely hot (10 to 20 million degrees Celsius) and extend into the corona. Solar flares occur near sunspots and can disturb radio communications on Earth.



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