Evolution The persistence of a dense atmosphere on Titan has been enigmatic as the atmospheres of the structurally similar satellites of Jupiter , Ganymede and Callisto , are negligible. While the disparity is still poorly understood, data from recent missions have provided basic constraints on the evolution of Titan's atmosphere. Layers of atmosphere, image from the Cassini–Huygens spacecraft Roughly speaking, at the distance of Saturn , solar insolation and solar wind flux are sufficiently low that elements and compounds that are volatile on the terrestrial planets tend to accumulate in all three phases .  Titan's surface temperature is also quite low, about 94 kelvins (K).   Consequently, the mass fractions of substances that can become atmospheric constituents are much larger on Titan than on Earth . In fact, current interpretations suggest that only about 50% of Titan's mass is silicates ,  with the rest consisting primarily of various H 2 O ( water ) ices and NH
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