Abstract Amino-acids, purines and pyrimidines may have been formed in space and brought down to Earth by comets during the final stage of the Earth's cold accretion from dust. Present-day comets seem to be the remnants of the building blocks of the early solar system, put for 4.6 billion years in “parking orbits” in the deep cold of space by the same process of orbital diffusion that brought a veneer of cometary material to the primitive Earth. The second part of the present review examines the chemical nature of comets as can be reconstructed from (so far) very incomplete evidence.
The cometary connection with prebiotic chemistry
Origins of life ; 14 , 1-4
1984
Article (Journal)
English
BKL: | 44.71 Verkehrsmedizin | |
Local classification TIB: | 535/3908/4290 |
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