These organic molecules form the smog which eventually rains back down on the surface. We expect liquid ethane and methane exists on the surface in seas, swamps, or "ground water". (No evidence of a global ocean in Hubble Space Telescope images of Titan.)

Past impacts on Titan could have melted the ice creating conditions (like in the early Earth) where amino acids and organic polymers might form.

We will know more about Titan when the Cassini spacecraft reaches Saturn in 2004. The Huygens probe will descend through the atmosphere of Titan and reach the surface. If it lands on a liquid surface, it will float and send back measurements; if it lands on a rocky surface, it will radio back images.

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