... News . ... New Cassini data from Titan indicate a rigid, weathered ice shell . ... This diagram of a cross-section through Titan's ice shell shows features that may explain the gravity anomaly: a low-density ice lens created by regional basal freezing; a rigid ice shell that resists upward deflection; and surface weathering that keeps topography small. ... An analysis of gravity and topography data from Saturn s largest moon, Titan, has revealed unexpected features of the moon s outer ice shell. ...