Self-assembly and morphogenesis in prebiotic systems, extraterrestrial and terrestrial

Details Self-assembly and morphogenesis in prebiotic systems, extraterrestrial and terrestrial Self-assembly and morphogenesis in prebiotic systems, extraterrestrial and terrestrial

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3441..247h&link_type=abstract

Proc. SPIE Vol. 3441, p. 247-253, Instruments, Methods, and Missions for Astrobiology, Richard B. Hoover; Ed.

Biology

Scientific paper

Recent findings strongly suggest that a well developed biosphere was present on Earth 3800 million years ago. Consequently life's origin must be considerably older. The remaining time span of Earth history appears to be too short for all the processes necessary for the evolution from a simple compound to a perfect organism. An alternative explanation implies that the prebiotic products required for the formation of life are of extraterrestrial origin and were imported from space with the early planetesimal in-fall that had struck the Earth prior to 3800 million years. Recent observations have detected a great variety of organic molecules in the interstellar clouds of our galaxy. Several molecules hitherto identified can be considered as precursors of the most biochemical compounds and structural components present in living systems. That prebiotic chemistry has been brought from interstellar space to Earth is an intriguing possibility. Cosmic dust can reach the Earth gently without being destroyed. Open to question is the condition in which the organics came down: were they at a prebiotic stage or in a biotic condition as originally postulated by Svante Arrhenius.

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