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| Description: The Sunspot Cycle (a) The number of sunspots on the Sun varies with a period of about 11 years. The most recent sunspot maximum occurred in 2001, and the most recent sunspot minimum occurred in 2007 (and continued through 2010). Picture Stats: Views: 580 Filesize: 100.34kB Height: 252 Width: 1350 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=18354 |