Definition
The primitive Earth experienced a large spectrum of impactors ranging from the huge Mars-sized impactor which created the Moon to cosmic dust less than 1 μm in size. A great number of organic molecules, including amino acids, have been found in carbonaceous chondrites. Micrometeorite collection and analysis from the Greenland and Antarctic ice sheets suggest that the Earth accreted large amounts of extraterrestrial complex organic molecules. Intense bombardment probably caused some chemical reprocessing of the Earth’s primitive atmosphere. Laboratory and space experiments support plausibility of the extraterrestrial delivery of organics to the primitive Earth.
Overview
Delivery of Extraterrestrial Organic Matter
Comets
Comets are the richest planetary objects in organic compounds known so far. Ground-based observations have detected hydrogen cyanide and formaldehyde in the coma of comets. In 1986, on board analyses performed by the two Russian missions Vega 1 and 2, as well...
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Brack, A. (2023). Extraterrestrial Delivery of Organic Compounds. In: Gargaud, M., et al. Encyclopedia of Astrobiology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-65093-6_565
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DOI: https://doi.org/10.1007/978-3-662-65093-6_565
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