German astronomer Johannes Kepler made sketches of sunspots in 1607 from his observations of the sun’s surface — and centuries later, the pioneering drawings are helping scientists solve a solar ...
Using modern techniques, researchers have re-examined Johannes Kepler's half-forgotten sunspot drawings and revealed previously hidden information about the solar cycles before the grand solar minimum ...
Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. German astronomer ...
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