Life depends on liquid water (H2O), a suite of biogenic elements (carbon (C), oxygen (O), nitrogen (N), sulfur (S), and phosphorous (P)), and a useful source of free energy. All these requirements are on Titan, the largest satellite of Saturn. An internal liquid ocean and a dense atmosphere determine a great exobiological significance of the satellite. The putative ocean may have a chemical composition useful to living organisms, which could maintain different biogeochemical cycles there.
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