Water Vapor found on Neptune-sized exoplanet

September 25, 2014 2:59 PM

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HAT-P-11b is smallest known exoplanet to contain atmospheric water

Though there have been several instances of astronomers detecting water vapor in the atmospheres of massive, Jupiter-like exoplanets, HAT-P-11b is different: It’s about the size of Neptune, making it the smallest known alien planet with water vapor in its atmosphere, according to researchers at the ...

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