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How big was the largest sunspot group?

April 26, 2017big group largest sunspot

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How big was the largest sunspot group?

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The largest sunspot group since 1900 was one in 1947 which measured 6132 millionths of the solar disk, or 18 times the surface area of the Earth. Check out this web site for more on sunspots: (Sunspots and the Solar Cycle) —> Go back to TOP.