It appears that way, at least. More than 100km of liquid water seems to reside beneath the surface of everyone’s favourite not-planet, Pluto, where it is tidally locked to Charon, its moon. Now, as with much science about the solar system, this is mathematical conjecture at the moment and not solid fact, but very often discoveries are first described in this way, and then an actual craft is sent to check the locale out. Until such time as there is disagreement, it appears that even on the edge of the solar system, there is liquid water, if one knows where to look.
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