the sun at a maximum of solar activity, occurring every 11 years.
solar activity, superimposed on an unchanging background.
How Do You Change Passive Voice Into Active Voice?In active voice, the subject performs the action of the verb. In passive voice, the subject receives the action of the verb. If you feel like you need a little more than that, keep reading.
Origin of active sun
First recorded in 1975–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019