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added by Katarzyna Dąbrowska July 11, 2017, 11:23 a.m.
The Sun activity increases during every ...
5 years
11 years
22 years
1300 years
Solar cycles have an average duration of about 11 years. The periodic changes in the Sun's activity include changes of the levels of solar radiation and the number and size of sunspots.
Katarzyna Dąbrowska
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Correct this question
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Very interesting!
reach: rather globalastronomySununiverse

Votes

+1 Very interesting!  globalquiz.org
      Acceptable  th3pizgat0r
+1 Very interesting!  Ninjai
+1 Very interesting!  Eolia