There was an article within the last two years about Earth having sub-crustal water amounting to more than all the surface oceans of the world. I do not know if I posted that here or at ATS ? Anyway with deep space spectra searches H2O is very common. What is surprising about Pluto is the lack of a big title force heating the interior like some of the moons of Saturn or Jupiter.. Yes Pluto has 5 known moons
Pluto is small as Charon is only around 606 km (377 mi) radius .. Is that enough for tidal force heating (evidently it is) ? Either that or Pluto has a hot beating heart.
Quote:[/url][url=https://en.wikipedia.org/wiki/Charon_(moon)]Charon (the largest, with a diameter just over half that of Pluto), Styx, Nix, Kerberos, and Hydra.
With half the diameter and one eighth the mass of Pluto, Charon is a very large moon in comparison to its parent body. Its gravitational influence is such that the barycenter of the Plutonian system lies outside Pluto.
Pluto is small as Charon is only around 606 km (377 mi) radius .. Is that enough for tidal force heating (evidently it is) ? Either that or Pluto has a hot beating heart.