Sunspots are correlated with solar activity, so the sun's 15-day spotless stretch is a sign of nearing solar minimum https://t.co/QiCfTGgAH9 pic.twitter.com/yBmJqZFwwR
— NASA Sun & Space (@NASASun) 23 March 2017
Sunspots are correlated with solar activity, so the sun's 15-day spotless stretch is a sign of nearing solar minimum https://t.co/QiCfTGgAH9 pic.twitter.com/yBmJqZFwwR
— NASA Sun & Space (@NASASun) 23 March 2017
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