Seasonal, year-long cycles seen on the sun
Greenbelt MD (SPX) Apr 12, 2015 - Our sun is constantly changing. It goes through cycles of activity - swinging between times of relative calm and times when frequent explosions on its surface can fling light, particles and energy out into space. This activity cycle peaks approximately every 11 years. New research shows evidence of a shorter time cycle as well, with activity waxing and waning over the course of about 330 days. ... more
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