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Nature 417, 419-421 (23 May 2002) | doi:10.1038/417419a;
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Thickness constraints on the icy shells of the galilean satellites from a comparison of crater shapes
A thin outer ice shell on Jupiter's large moon Europa would imply easy exchange between the surface and any organic or biotic material in its putative subsurface ocean. The thickness of the outer ice shell is poorly constrained, however, with model-dependent estimates ranging from a few kilometres to ten or more kilometres.
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