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Message: <blockquote data-quote="WayneLigon" data-source="post: 6254146" data-attributes="member: 3649">There are some contending theories that even a billion years or so was not enough time for the primordial molecules to assemble and make that move from inorganic to organic; these basically try to plot Moore's Law to biological systems by regressing from current complexity to the primordial state, and come up with a time-of-origin of something like 9 billion years. A problem, since our solar system is something like 4-5 billion years old at most.Most of the theories are not really saying 'life' but 'organic primordial molecules', kind of 'pre-life'. These can form in space itself and be propagated by the solar wind, or be hardy enough to somehow survive the 'exit-travel through space-survive re-entry' cycle of a grazing collision elsewhere.Earth's water seems to be a balance of stuff it produced naturally, and stuff it accumulated as icy bodies were drawn in. Without knowing the composition of most Kuiper Belt objects, it's difficult to say how much may have come from the solar system leftovers. One of the reasons that panspermia has been given an uptick in recent years is the discovery that some of our old suppositions about the formation of life - it must have sunlight, it must have water, it can only form in x-y temperatures - all that is pretty much crap due to discovering several forms of life that require none of those things and that can exist and evolve in conditions we previously thought impossible.</blockquote>

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