Comets and prebiotic chemistry: the volatile component

Details Comets and prebiotic chemistry: the volatile component Comets and prebiotic chemistry: the volatile component

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.518..123d&link_type=abstract

In: Proceedings of the First European Workshop on Exo-Astrobiology, 16 - 19 September 2002, Graz, Austria. Ed.: Huguette Lacoste

Biology

1

Comets: Chemistry

Scientific paper

Comets may deliver simple (HCN, H2CO...) or more complex (amino acids, nuclear bases...) molecules important for prebiotic chemistry on the early Earth. We present a (provisional) reference list of 27 cometary volatile abundances (plus 8 upper limits), and discuss its validity limits. Recent results are detailed. Glycine upper limit is not stringent (<0.5% H2O) and says nothing on its possible presence in organic refractories. Comet contribution to Earth oceans appears low (<10%). Future work needed to improve our appreciation of the importance of comets for prebiotic chemistry is outlined.

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