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Saturn's Titan: A strict test for life's cosmic ubiquity

Is life a common outcome of physical and chemical processes in the universe? Within our own solar system, a successful search for even primitive life, were it to have an origin independent from life on Earth, would dramatically advance a positive answer. The most stringent test for a second independent origin of life on Earth would come from examination of either the most physically remote from Earth, or the most exotic type, of planetary environments in which one might plausibly imagine a form of life could exist. In this paper I argue that Saturn's moon Titan is the best such target in our solar system. Further, Titan might be a type example of a planetary environment abundant throughout the cosmos.