active sun
nounAstronomy.
the sun at a maximum of solar activity, occurring every 11 years.
solar activity, superimposed on an unchanging background.
Origin of active sun
1First recorded in 1975–80
- Compare quiet sun, solar cycle.
Words Nearby active sun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
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