Recent studies have unveiled surprising evidence of subsurface oceans on moons previously considered unlikely candidates. Saturn's moon Mimas, often dubbed the "Death Star" due to its large crater, has been found to harbor a global ocean beneath its icy surface. Researchers analyzing data from NASA's Cassini spacecraft observed that Mimas exhibits a rocking motion, known as libration, which suggests the presence of a liquid ocean rather than a solid core. This discovery challenges earlier assumptions and indicates that even small, seemingly unremarkable moons can possess environments conducive to life. The findings, published in Nature, highlight the dynamic nature of celestial bodies and the potential for habitability in unexpected places.
Similarly, observations from NASA's James Webb Space Telescope have provided compelling evidence for a subsurface ocean on Uranus's moon Ariel. The detection of carbon dioxide ice on Ariel's surface, particularly on its trailing hemisphere, suggests that a hidden ocean lies beneath its icy crust. This discovery adds Ariel to the growing list of moons with potential subsurface oceans, including Jupiter's Europa and Saturn's Enceladus. The presence of such oceans raises intriguing questions about the potential for life beyond Earth and underscores the importance of continued exploration and study of these distant worlds.