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Tar­get: Europa, Ganymede and Cal­listo

NASA’s Galileo or­biter spent al­most eight years in or­bit around the gi­ant planet Jupiter and stud­ied each of its gi­ant moons. Galileo’s mag­ne­tome­ter in­stru­ment de­tected changes to Jupiter’s mag­netic field around Europa, Ganymede and Cal­listo, which in­di­cate the pres­ence of salt­wa­ter oceans on each. The probe also cap­tured de­tailed pho­to­graphs of Europa that point to a crust of shift­ing ice rafts above an ocean warmed by hy­dro­ther­mal vents.

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