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physical phenomena > event > celestial event > periodic celestial event > active Sun

active Sun comparison table

Subject	occurs on	is an instance of	is a kind of	has definition
periodic celestial event			celestial event	Celestial event which occurs with a very regular period
solar event	Sun		celestial event
active Sun	Sun	solar event		The Sun during its 11-year cycle of activity when spots, flares, prominences, and variations in radiofrequency radiation are at a maximum.

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