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active sun

noun, Astronomy.
1.
the sun at a maximum of solar activity, occurring every 11 years.
2.
solar activity, superimposed on an unchanging background.
Origin of active sun
1975-1980
First recorded in 1975-80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Word Value for active

11
13
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