Ceres is by and large H2O (by volume). https://en.wikipedia.org/wiki/Ceres_(dwarf_planet)#Internal_structure https://en.wikipedia.org/wiki/Ceres_(dwarf_planet)

Ceres is by and large H2O (by volume). https://en.wikipedia.org/wiki/Ceres_(dwarf_planet)#Internal_structure https://en.wikipedia.org/wiki/Ceres_(dwarf_planet)#Internal_...