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In 2013 the Hubble Space Telescope found evidence of geysers on Jupiter's moon Europa. But finding them again has proven difficult.

Jupiter's moon Ganymede is the largest moon in the solar system and likely has a salty ocean underneath its icy surface.

Europa is an icy moon of Jupiter and one of the four so-called Galilean moons of Jupiter. See more facts about Europa and its history here.

Europa keeps releasing plumes of water vapor, something that Cassini already found out, and that's building up anticipation for the Europa Clipper mission even more. But there's something weirder going on.

Since the Voyager probes passed through the Jupiter system in 1979, scientists have been intrigued and mystified by its moon Europa. Once the images these probes acquired of the moon's icy surface returned to Earth, scientists began to speculate about the possibility of a subsurface ocean. Since the