I said it doesn't appear to have the resources comparable to Earth. The Moons of both Jupiter and Saturn have high concentrations of hydrocarbons, Carbon is abundant in the middle of the solar system, at least from Venus outwards to Saturn and Uranus. <br /><br />Earth seems to be the only place it formed life. In the outer Solar system temperature pretty much determines what molecules are formed and the atmosphere on Titan could be explained chemically much easier than biologically. Of course higher molecules of hydrocarbons are going to form when condition exist, they do naturally. <br /><br />To equate that to life having an involvement would require what we see here on Earth, Oil, coal, the products of biological processes. If a swamp existed in the primordial Mars theorized, and life existed, then complex hydrocarbon deposits should exist. <br /><br />What we see is Methane, Ethane and hydrocarbons at the lower end of the molecular chain. So far I haven't seen any indication of biology and since Mars seems to be the best candidate, besides Earth to harbor, or have harbored, life I think the odds are pretty slim to find it has existed. <div class="Discussion_UserSignature"> </div>