FRANK ZULLO/SCIENCE PHOTO LIBRARY
If the first primitive animals crawling around on the seabed had somehow built telescopes, they would have seen something remarkable. The sun would have grown more and less active over an 11-year cycle, just as it does today. That’s because our star has maintained the same steady cycle for more than 700 million years.
The solar cycle is most visible as the number of relatively dark sunspots on the sun’s surface. During a solar maximum there are many sunspots, and hardly any during a …
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