Unformatted text preview: nterior or implanted by impact.
Long, dark lines are fractures in the crust, some of which are more than 3,000 kilometers (1,850 miles) long. The bright feature
containing a central dark spot in the lower third of the image is a young impact crater some 50 kilometers (31 miles) in
The right image shows a close-up view of the icy surface of Europa. The smooth area at left resulted from ﬂooding by a ﬂuid
which erupted onto the surface and buried ridges like those at right. Europa may house a deep liquid water ocean NASA/JPL
21 Geologic features on the surface might be explained by a layer of liquid water with a possible depth of more than 100
kilometers below a cold, brittle surface ice crust.
If a 100 kilometer (60 mile) deep ocean existed below a 15 kilometer (10 mile) thick Europan ice crust, it would be 10 times
deeper than any ocean on Earth and would contain twice as much water as Earth's oceans and rivers combined.
Cracks and ﬁssures on surface – upwelling?
Tidal heating not as strong as on Io. Ganymede
‣ Largest moon in the
‣ 8% larger diameter than
‣ Twice the mass...
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