The Chemical Evolution of Titan's Volatiles

Mathematics – Logic

Scientific paper

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Scientific paper

Amongst more than one hundred known planetary moons, only a handful are endowed with an atmosphere. Titan is one. It is also unique, for having an atmosphere of nitrogen, four times denser than our own and with a pressure that exceeds the Earth's surface pressure by 50%. Moreover, methane is a dominant component of Titan's atmosphere. It is this combination of nitrogen and methane that results in a moon that is perpetually shrouded in photochemical smog. Methane itself creates a cycle, similar to hydrological cycle on Earth, complete with surface evaporation, cloud formation, and rain. Methane is also crucial to the maintenance of Titan's nitrogen atmosphere. On the other hand, methane is irreversibly destroyed in tens to hundred million years. Thus the very presence of methane and nitrogen on this cold and distant object is a puzzle, but measurements made with Cassini-Huygens are beginning to unravel some mysteries. In this talk, I will discuss certain key aspects of the origin and evolution of Titans' principal volatiles.

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