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 exopl... https://www.engadget.com/2019/09/11/water-vapor-exoplanet-rocky-core/" target="_blank">Read More . . .

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