Abstract
Recent estimates of the solar isotopic compositions of C and N, deciphered from the solar wind component implanted into lunar grains, suggest that bulk of meteoritic C and N are largely enriched in 13C and 15N compared to their proto-solar compositions. Since C and N in primitive meteorites are predominantly in form of organics, such information permits us to explore the possible place and processes of organic birth in the interstellar or circumstellar gas medium. Systematic enrichment of 13C in bulk of meteoritic organics, by ~10 % compared to the proto-solar composition, implies that the bulk of meteoritic organics could have formed in a warm and dense space medium, such as in the proto-planetary disk illuminated by ultra-violet light from the proto-Sun.
