Johannes Kepler thought he sketched Mercury orbiting across the sun. What he actually captured has solved a solar mystery
By Ashley Strickland, CNN (CNN) — 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. Even though everything in the solar system revolves around the sun, scientists have yet to unlock many of
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