Rocky, overweight planet shakes up theories

Distant exoplanet is as massive as Neptune but has a composition closer to Earth's

PLUMP PLANET  Kepler-10c, a rocky planet 17 times as massive as Earth, orbits its sun in an artist’s illustration. Its sister planet, Kepler-10b, is in the background, sitting much closer to the star.

David A. Aguilar/CfA

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