Some earthlike alien planets may begin as 'mini-Neptunes'

February 2, 2015 2:39 PM

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Some earthlike alien planets may begin as 'mini-Neptunes'

This artist's illustration depicts the transformation of a "mini-Neptune" exoplanet, orbiting a red dwarf star, into a potentially habitable rocky world. (Rodrigo Luger (adapted from NASA images))

Some Earthlike alien worlds may have looked a lot more like miniature versions of Neptune when they were born.

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