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Asteroids and the origin of life—two steps of chemical evolution on the surface of these objects

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Abstract

It is now well-known that carbonaceous chondrites contain large quantities of prebiotic molecules, including amino acids, carbohydrates, and heterocyclic bases of nucleic acids. It has become evident that the chemical evolution proceeds under conditions of open space, which serves as a huge chemical reactor. The extraterrestrial origin of these prebiotic molecules has been established on the basis of diversity, molecular structure, and isotopic composition. The molecular composition of a meteorite’s organics resembles abiotic processes governed by physico-chemical processes that occurred on the parent bodies, including asteroids. The synthesis of soluble compounds in carbonaceous chondrites consists of a multi-step process in which organic precursors were formed in the interstellar cloud, incorporated with many volatiles into icy planetesimals and, upon aqueous processing produced the variety of compounds which can form complexes under space energy sources. We show experimentally that the solid mixtures of biologically significant compounds (nucleosides and amino acids) produce more complex compounds when they are exposed to either vacuum UV photons or ionizing radiation.

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Correspondence to M. B. Simakov.

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Simakov, M.B. Asteroids and the origin of life—two steps of chemical evolution on the surface of these objects. Earth Planet Sp 60, 75–82 (2008) doi:10.1186/BF03352764

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Key words

  • Chemical evolution
  • abiogenic synthesis
  • amino acids
  • nucleotides