Examples of cometary

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The organic compounds represent analogues for abundant meteoritic and cometary molecules and include aliphatic and aromatic hydrocarbons, fullerenes, amino acids, nucleo-bases and carbonaceous solids.
It was found that meteoroids from cometary sources were typically of porous, aggregate compositions with relatively low densities.
Nevertheless, their chemical structure, particularly in cometary grains, is poorly elucidated.
746 were, in fact, the result of asteroidal or cometary impact.
This dispute regarding the relevance of the cometary evidence continues into the sixteenth century.
We will discuss some aspects of the delivery process, and confront cometary species to the ' needs ' of prebiotic chemistry.
In supposed work is analyzed the possibility of formation of chemical composition the cometary's atmosphere under effect of electric discharges.
For more than twenty years, many laboratory experiments have been devoted to the study of the chemistry of cometary and interstellar ices.
The fluffy nature of cometary material facilitates the degradation of these particles in the interplanetary medium.
In a regime of low plasma densities (typical of cometary environments) the effects of collisions and dust charge fluctuations are negligible.
These images will help to understand the formation processes of cometary material and the role of the organic and inorganic components therein.
Thus, cometary interiors seem to favour the chirality selection of amino acids and sugars found in present-day biology.
However, no direct evidence for any biological material in a comet or in cometary dust has ever been found.
In the context of cometary ices, which are essentially made of water and methanol, this polymerization trend of dicyanogen is of particular interest.
These data indicate that cometary grains are rich in various and complex organic compounds and show compositional and structural heterogeneities.
Owing to this very high radiation dose it is assumed that the first cometary layer is completely radiation-processed.
Therefore, the organic matter locked in cometary bodies remains in its primitive state.

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