Ceres, the dwarf planet in the asteroid belt, has water under the surface - although it may be a bit muddy and salty. https://www.theguardian.com/science/2020/aug/10/planet-ceres-ocean-world-sea-water-beneath-surface #space
Dwarf planet, believed to be a barren space rock, has an ‘extensive reservoir’ of brine beneath its surface, images show
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