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what is mean by sun spots
Sunspots are areas on the sun's photosphere, or surface, which appear darker than the rest of the sun. The photosphere of the sun, or any gaseous celestial body, is the layer of gases which makes up the visible surface. On the sun, the photosphere is extremely deep, stretching for hundreds of miles. Beneath the photosphere lies the solar core, the powerhouse of the sun, which produces energy and heat. Primarily this is accomplished by converting hydrogen into helium in a form of nuclear reaction. Sunspots stand out strongly against the bright surface of the sun, and have been observed for thousands of years.


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