Once thought frozen and geologically dead, Mimas may host a global liquid ocean just beneath its icy shell. By analyzing Cassini data—tiny librations, apsidal precession, and recent surges in orbital eccentricity—scientists infer a 20–30 km ocean decoupling the crust from the core. The ocean's youth, formed within the last 5–25 million years, provides a unique glimpse into how ocean worlds begin and where habitable conditions might arise beyond the planets we know.

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