The new observations affirm that Titan is one of the likeliest places to look for life in our solar system. Some astrobiologists have speculated that life could develop in the moon's hydrocarbon lakes, although it would have to be substantially different from known life on Earth, which requires liquid water. Mixed in solution with the ethane, the lake is also believed to contain nitrogen, methane, and a variety of other simple hydrocarbons. The Cassini-Huygens probe determined the chemical composition of the liquid by the way it reflected light, a technique known as spectrometry that has provided most of our knowledge about other planets' atmospheric compositions. http://blog.wired.com/wiredscience/2008/07/lake-of-petrole.html
We know life can survive at 400.C, in pH2, under huge pressures, in a vacuum, miles underground and so on. SF authors have suggested life based on other things than carbon and water. It is possible a whole range of life we cannot presently imagine exists.
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