Tuesday, January 7, 2014

Exoplanet Menagerie

Astronomers plumbing Kepler data have found five more rocky planets only slightly larger than Earth.  They're also beginning to talk about a new class of world-- "mini-Neptunes" similar in composition to Neptune, but only perhaps four times as massive as Earth.

No doubt many more classes of exoplanets will be defined in the years ahead.

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