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In Photos: Stunning Views of Titan from Cassini

Titan interior

An artist's conception showing the layers of Saturn's moon Titan.

(Image credit: NASA/JPL)

Gravity-field data collected by Cassini instruments suggest Titan's interior is a chilly mix of ice studded with rock, though it seems the outermost shell of Titan (down to about 300 miles or 500 km) is devoid of any rock. The layers in the Titan artist's illustration show the moon's hazy surface (yellow), an ice layer starting near the surface (light gray), a possible internal ocean (blue), another layer of ice (light gray) and a mix fo rock and ice in the interior (dark gray).