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Home The surface geology of Jupiter’s icy moon Europa is on display in this view made from images taken by NASA’s Galileo spacecraft in the late 1990s. (NASA/JPL-Caltech/SETI Institute) The surface geology of Jupiter’s icy moon Europa is on display in this view made from images taken by NASA’s Galileo spacecraft in the late 1990s. (NASA/JPL-Caltech/SETI Institute)

The surface geology of Jupiter’s icy moon Europa is on display in this view made from images taken by NASA’s Galileo spacecraft in the late 1990s. (NASA/JPL-Caltech/SETI Institute)

The surface geology of Jupiter’s icy moon Europa is on display in this view made from images taken by NASA’s Galileo spacecraft in the late 1990s. (NASA/JPL-Caltech/SETI Institute)

The surface geology of Jupiter’s icy moon Europa is on display in this view made from images taken by NASA’s Galileo spacecraft in the late 1990s. (NASA/JPL-Caltech/SETI Institute)

A double ridge cutting across the surface of Europa is seen in this mosaic of two images taken by NASA’s Galileo during the spacecraft’s close flyby on Feb. 20, 1997. Analysis of a similar feature in Greenland suggests shallow liquid water may be ubiquitous across the Jovian moon’s icy shell. (NASA/JPL/ASU)