541 place 0

600 Alien water worlds were just a mirage

ScienceDaily
ScienceDaily · today 01:47 EDT

A new study challenges the dream of water-rich “Hycean” planets like K2-18b, suggesting that most sub-Neptunes lose their water deep into their interiors during formation. Instead of vast oceans, these worlds likely retain only a few percent of water at the surface.

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