Mystery of the solar cycle solved

suns, solar system

Variable sun: images of the European space telescope SOHO in the extreme ultraviolet range over two activity cycles.

The number of sunspots is at its greatest every 10.4 years. Researchers have now been able to prove this for the first time over a millennium - and finally clarify the cause.


In 1829, Samuel Heinrich Schwabe sold his pharmacy in Dessau. He didn't

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