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Scientists discover water vapor on an exoplanet with a rocky core

Marc DeAngelis
Contributor
Scientists discover water vapor on an exoplanet with a rocky core

Water vapor is common in gas giants; Jupiter, Saturn, Uranus and Neptune all have H2O floating around in their atmospheres. But water on a rocky planet is exceedingly rare, making the discovery of water vapor -- and possibly even rain -- on the exoplanet K2-18 b a surprising breakthrough.