Data collected by the Cassini spacecraft shows that Titan, the largest moon of Saturn, has an interior composed of a mixture of ice and rock. This finding is based on Cassini's observations of Titan's gravity and shape.

Cassini's gravity measurements, made by precisely tracking the spacecraft's orbit around Saturn, provided information about Titan's mass and moment of inertia, a measure of how mass is distributed within a body. Combined with Cassini's radar topography data, which mapped Titan's surface features, these gravity measurements allowed scientists to infer the moon's internal structure.

The results show that Titan's outer shell, which extends to a depth of about 1,000 kilometers, is composed of approximately 70 percent rock and 30 percent ice. Below this shell, the interior is progressively more ice-rich, with a rocky core making up about 25 percent of the moon's total mass.

This ice-and-rock mixture has important implications for Titan's geological and surface processes. The presence of internal water could potentially support liquid water reservoirs, which are crucial for habitability. Furthermore, the variation in ice content within Titan's interior could lead to convection-driven heat transport and geological activity, sculpting the moon's surface and driving Titan's diverse landscape features.

The findings from Cassini's observations contribute significantly to our understanding of Titan's internal structure and dynamics, providing new insights into the evolution and processes that shaped this fascinating moon. Further exploration and research into Titan's interior will continue to deepen our knowledge of this remarkable celestial body.