I’m so looking forward to what JUICE uncovers! Europa has been centre stage and is getting its own dedicated mission, but the more we find out about those outer moons, the more fascinating they get. Ganymede is the largest in the solar system and has its own magnetic field. And Callisto being an ocean world? It wouldn’t surprise me if Ganymede is also.
Don’t land on Europa and if you’re right, I bet they make the same contract over that too. That, being the monolith’s ban.
They found that Callisto’s ionosphere alone cannot explain all existing observations, but that a subsurface ocean in combination with the ionosphere can. Further exploring which scenarios best fit the data, the researchers predicted that the ocean is likely at least tens of kilometers thick, as measured from the top of the liquid ocean to its seafloor, and encased beneath a solid ice shell that itself could range from tens to hundreds of kilometers thick.
Life on Callisto would have a worldview not unlike that of the Krikkiters.
