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Overweight planet shakes up theory: Kepler-10c is the most massive rocky world yet discovered.
Common wisdom in astronomy says that once a planet has collected about 10 Earths' worth of rock, it draws in gas and becomes a gas giant like Neptune or Saturn. The exoplanet Kepler-10c didn't get that memo. With 17 times the mass of Earth, the distant planet is the heaviest rocky planet known. And astronomers have no idea how it formed.
With the mass of Neptune squeezed into a ball only about 2.4 times as wide as our planet, gravity on Kepler-10c is three times stronger than Earth's,...
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