Getting to Know Titan Gravity-field measurements provide information on the interior structure of planets and their moons. Iess et al. (p. 457 ; published online 28 June) analyzed gravity data from six flybys of Saturn's moon, Titan, by the Cassini spacecraft between 2006 and 2011. The data suggest that Titan's interior is flexible on tidal time scales with the magnitude of the observed tidal deformations being consistent with the existence of a global subsurface water ocean.

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