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Astronomical Origins of Life - Steps Towards Panspermia (Paperback, Softcover reprint of the original 1st ed. 2000)
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Astronomical Origins of Life - Steps Towards Panspermia (Paperback, Softcover reprint of the original 1st ed. 2000)
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Living material contains about twenty different sorts of atom
combined into a set of relatively simple molecules. Astrobiologists
tend to believe that abiotic mater ial will give rise to life in
any place where these molecules exist in appreciable abundances and
where physical conditions approximate to those occurring here on
Earth. We think this popular view is wrong, for it is not the
existence of the building blocks of life that is crucial but the
exceedingly complicated structures in which they are arranged in
living forms. The probability of arriving at biologically
significant arrangements is so very small that only by calling on
the resources of the whole universe does there seem to be any
possibility of life originating, a conclusion that requires life on
the Earth to be a minute component of a universal system. Some
think that the hugely improbable transition from non-living to
living mat ter can be achieved by dividing the transition into many
small steps, calling on a so-called 'evolutionary' process to
bridge the small steps one by one. This claim turns on semantic
arguments which seek to replace the probability for the whole chain
by the sum of the individual probabilities of the many steps,
instead of by their product. This is an error well known to those
bookies who are accustomed to taking bets on the stacking of horse
races. But we did not begin our investigation from this point of
view.
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