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At least according to NASA's interpretation.
Both measurements of the gravitational field and of the rotation rate of the surface agree on that. If the surface is not connected to the core, its libration is stronger, and apparently the observed magnitude is not compatible with a solid connection between ice and core.
NASA press release
Both measurements of the gravitational field and of the rotation rate of the surface agree on that. If the surface is not connected to the core, its libration is stronger, and apparently the observed magnitude is not compatible with a solid connection between ice and core.
NASA press release
I don't find it there yet, the press release doesn't give much detail.The research is presented in a paper published online this week in the journal Icarus.