Scientists studying exoplanets now believe that the class they've described as "mini-Neptunes" (just over twice the size of Earth) may actually be "rocky exoplanets covered by thick, deeply-irradiated oceans", according to an article on Futurism.
The article, on research by scientists at the Laboratoire d’Astrophysique de Marseille, explains:
"...some may have oceans of highly pressurized and heated supercritical liquid that’s been irradiated by a powerful greenhouse effect. The ocean, just like a gas giant’s atmosphere, could account for the low density and mass of the exoplanets."Just something else trying to kill your explorers in a cold, uncaring universe!
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