Chimie organique prébiotique dans des environnements planétaires.

Details Chimie organique prébiotique dans des environnements planétaires. Chimie organique prébiotique dans des environnements planétaires.

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989anph...14..207r&link_type=abstract

Ann. Phys. (Paris), Vol. 14, No. 2, p. 207 - 233

Physics

Organic Molecules: Origin Of Life, Organic Molecules: Titan

Scientific paper

Life probably appeared on the Earth after a long chemical evolution. The transformation of simple organic molecules, through physical chemical processes of increasing complexity, would have allowed the formation of the biomacromolecules. The origin of these simple organics, precursors of the prebiotic chemistry, is still controversial (atmosphere? oceans? meteoritic or cometary impacts?). However their nature is now well defined. When considering the atmospheric composition of the different planets of the solar system, one can observe a good agreement between previsions of the organics likely to be present, from the data of simulation experiments, and observations. In particular, the discovery of a complex organic chemistry on Titan, in spite of the absence of water, confirms that the best prebiotic atmosphere implies the presence of methane and nitrogen as major atmospheric components and a low mole fraction of hydrogen.

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