Saturn's largest moon, Titan, is kind of like what you'd expect if Salvador Dali designed a planet. It has methane lakes, electrically charged sand, and allegedly, an ocean hiding under its crust. While the Cassini and Huygens spacecraft have revealed some of these mysteries to us, so many lingering questions about this weirdo moon remain.
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Pluto's moon Charon is the best sidekick a dwarf planet could hope for: Unwavering in its loyalty, content to be a minor character in somebody else's narrative. But two years after the New Horizons flyby, the largest of Pluto's five moons is finally getting some well-deserved time in the spotlight. New research suggests that Charon's storied history includes tectonic activity, cryovolcanism and, perhaps, a globe-spanning ocean.
The evidence is mounting that our solar system is rife with oceans. Last week, scientists reported that Pluto could have an insanely deep liquid water swimming pool beneath its surface, and this week, NASA revealed new evidence for geyser activity on icy Europa. Now, another frozen moon is poised to join the club of outer space scuba retreats: Dione.