The abstract for a recent paper on Titan says:
Titan's orbit, recently measured to a high degree of accuracy, looks more like an object with an ocean sloshing around than like a solid object. The story is expanded on in this blog post.
Read the comments on this post...
...We propose a new Cassini state model for Titan in which we assume the presence of a liquid water ocean beneath an ice shell and consider the gravitational and pressure torques arising between the different layers of the satellite....
Titan's orbit, recently measured to a high degree of accuracy, looks more like an object with an ocean sloshing around than like a solid object. The story is expanded on in this blog post.
Read the comments on this post...