Ganymede's subsurface ocean dwarfs Earth's waters but remains sealed beneath an icy crust

Jupiter's moon Ganymede likely contains more liquid water than all of Earth's oceans combined, hidden beneath a thick icy crust. Scientists estimate this subsurface ocean extends roughly 150 kilometers below the frozen surface, but remain uncertain whether any of it has ever breached outward. The finding adds to speculation about possible habitable conditions on distant moons.