Europe's JUICE mission will explore the Jupiter ocean moons Callisto, Europa and Ganymede. Here's why they're so weird

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The icy Jupiter moons Callisto, Europa and Ganymede all likely host hidden global oceans, but that's not the only reason they stand out.

Europe's JUICE mission will explore the Jupiter ocean moons Callisto, Europa and Ganymede. Here's why they're so weird : Read more