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Date: 2015-04-16 18:05:21Astrobiology Space colonization SETI Exoplanetology Habitable zone Planetary habitability Red dwarf Super-Earth Planet Astronomy Space Planetary science | Some potentially habitable planets began as gaseous, Neptune-like worldsAdd to Reading ListSource URL: phys.orgDownload Document from Source WebsiteFile Size: 40,91 KBShare Document on Facebook |