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- W2023220704 abstract "Abstract Primary organic syntheses first occurred in interstellar space, where more than sixty different organic molecules have been identified. The most important identifications for prebiotic chemistry probably are HCN, H 2 CO, CH 3 CN, C 2 H 2 and CH 3 C 2 H, although many others could play important roles. A fraction of these molecules condense, with ubiquitous H 2 O and CO 2 , on interstellar grains that follow suit when a molecular cloud collapses gravitationally to form a star. An accretion disk surrounds the growing star, and the frosty interstellar grains are more or less heated depending on their distance to the central star. The innermost loose their water and carbon compounds and will form the rocky planets; those at intermediate distances loose most of their water only, and will form the parent bodies of the carbonaceous chondrites. The outermost keep all their frost and will become the comets. Eventually, the orbits of all those minor bodies diffuse into the inner solar system and bombard the inner rocky planets. Their numerous impacts has brought a veneer that explains the atmosphere and the oceans of the Earth, as well as the source of a wealth of organic compounds. Comets and carbonaceous chondrites are the messengers that have brought down to Earth the products of the primary organic syntheses that were ubiquitous in space." @default.
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- W2023220704 date "1989-01-01" @default.
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- W2023220704 title "Have comets played a role in the primary organic syntheses?" @default.
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