Earth-mass planet resembles a mini-Neptune

Exoplanet 200 light-years away made mostly of gas, not rock

By Andrew Grant, 15:45 PM January 8, 2014

OXON HILL, Md.— A newly discovered exoplanet weighs about the same as Earth — but that’s where the similarities end. Its discovery, reported January 6 at the American Astronomical Society meeting and online at, illustrates the complexities of classifying planets outside the solar system.

The planet, KOI-314c, orbits a small, cool star 200 light-years away in the constellation Lyra. While the planet’s mass is similar to Earth’s, its diameter is 60 percent larger, said David Kipping, a...

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