What's the New Goldilocks Paradigm?

Io is kind of like Venus. It's got too much tidal energy. Ganymede and Europa in particular, we think occupies this new Goldilocks sweet spot where it's got just the right amount of tidal energy dissipation. To sustain a global salty liquid water ocean, that's 100 kilometers or 60 miles in depth. How deep are our oceans? So it's about 10 times as deep as their ocean. Holy smokes, the octopods must have. There's a lot of water out there.

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