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Sotto la sua superficie ghiacciata, Plutone nasconde un oceano avvolto da uno strato di gas, dimostrando ancora una volta quanto il nostro Sistema Solare sia ricco di acqua.
La dimostrazione arriva dallo studio pubblicato sulla rivista Nature Geoscience dal gruppo delle Università giapponesi di Hokkaido, Kobe e Osaka e dell'Istituto di Tecnologia di Tokyo, basato sui dati racconti dalla sonda della NASA New Horizons, che nel 2015 ha scattato le prime immagini ravvicinate del pianeta nano. Secondo gli autori della ricerca, l'oceano di Plutone sarebbe avvolto e protetto da una gabbia di metano gassoso, che fungerebbe da isolante termico tra la sua superficie ghiacciata e il lago sotterraneo, proteggendolo dal congelamento.
Per i planetologi giapponesi, lo studio dimostra che "la presenza di oceani sommersi nel Sistema Solare è più comune di quanto si pensasse, rendendo più probabile la presenza di forme di vita".
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