Jupiter’s four largest moons may be conspiring to maintain their subsurface oceans. Long thought to arise from heat generated by the crust-flexing pull of Jupiter, these oceans may also owe their existence to immense subsurface tidal waves generated by gravitational interactions among the moons. Measuring such tides can provide insights about the depths of these lunar abysses—environments that may offer the best chances for finding extraterrestrial life in our solar system.

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