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One of the reasons is that the Cassini mission ended on September 15, 2017, and Juno around Jupiter isn't exploring its moons, as far as I'm aware. So currently we have nothing around Saturn and Jupiter that would explore any of its moons.


The icy moons are of interest for exploration as part of the overall "follow the water" strategy of exploration that NASA (and others) have been exploring for some time. The "where else can water be found" is a major question in e.g. the US Planetary Science Decadal Survey (which is a community-driven consensus document which outlines the questions of ...


The motivation is the growing understanding, from the Voyager, Galileo and Cassini probes, that these icy moons (I'd throw in Enceladus) are geologically active with sub-surface oceans of liquid water, along with the realization (from studying the Earth's ocean vents and deep biosphere) that life can be sustained from the energy of geologic processes, not ...

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