Europa, one of Jupiter's Galilean moons, has twice as much liquid water as Earth's oceans, if not more. An ocean estimated to be anywhere from 40 to 100 miles (60 to 150 kilometers) deep spans the entire moon, locked beneath an icy surface over a dozen kilometers thick. The only direct evidence for this ocean is the plumes of water that occasionally erupt through cracks in the ice, jetting as high as 200 km above the surface.

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为冰冷的放射性地狱制造的天线：JPL 的全金属设计可以承受欧罗巴的残酷环境

木卫二是木星的伽利略卫星之一，它的液态水是地球海洋的两倍，甚至更多。估计有 40 到 100 英里（60 到 150 公里）深的海洋横跨整个月球，被锁定在十几公里厚的冰面之下。这个海洋的唯一直接证据是偶尔从冰裂缝中喷出的水柱，喷射到地表上方 200 公里处。