Scientists Find New Evidence of Hidden Ocean World in Our Solar System

Planetary scientists have a fascinating hypothesis about Saturn's smallest moon, Mimas, which they say may be home to a "stealth" underground ocean that's been hidden from our best observations.
In a press release out of the Southwest Research Institute, principal scientist Dr. Alyssa Rhoden said that NASA's Cassini mission to Saturn had "identified a curious libration, or oscillation, in Mimas' rotation, which often points to a geologically active body able to support an internal ocean."
Translation: Mimas' wobble seems to suggest that it could contain an ocean under its icy surface.
A specialist in the geophysics of icy satellites — say that three times fast! — Rhoden is one of the authors of a new paper published in the journal Geophysical Research Letters about the tantalizing hypothesis centered on Saturn's smallest and innermost moon, which she jokingly admitted looks "much like the Death Star from Star Wars" because of Herschel, its huge impact crater.
Scientists Find New Evidence of Hidden Ocean World in Our Solar System