A cluster of sunspots appears on the surface of the sun on October 18, 2014.
Mandatory Credit: NASA Goddard via CNN Newsource
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Johannes Kepler thought he sketched Mercury orbiting across the sun. What he actually captured has solved a solar mystery
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 mystery.
