Impossibly heavy planet is the first 'mega-Earth'

June 3, 2014 4:22 PM

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Sly Stallone has nothing on this rocky heavyweight. Twice the size of Earth and with 17 times our planet's mass, Kepler-10c is so unusual that it has been placed in a brand new class of exoplanet.

Kepler-10c was discovered in 2011 by NASA's Kepler space telescope. The planet orbits a star that is about 560 light years away from us. It has a radius slightly more than double that of Earth's – a size that led astronomers to assume it was a shrunken version of gassy planet Neptune, which is four ...

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