A rigid and weathered ice shell on Titan

@article{Hemingway2013ARA,
  title={A rigid and weathered ice shell on Titan},
  author={Douglas James Hemingway and Francis Nimmo and Howard A. Zebker and Luciano Iess},
  journal={Nature},
  year={2013},
  volume={500},
  pages={550-552}
}
Several lines of evidence suggest that Saturn’s largest moon, Titan, has a global subsurface ocean beneath an outer ice shell 50 to 200 kilometres thick. If convection is occurring, the rigid portion of the shell is expected to be thin; similarly, a weak, isostatically compensated shell has been proposed to explain the observed topography. Here we report a strong inverse correlation between gravity and topography at long wavelengths that are not dominated by tides and rotation. We argue that… 

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