Nebular processes recorded in chondritic meteorites

The key fact concerning the chondritic meteorites is that they consist of grains that were present in the solar nebulae. The most primitive (least altered) of them have preserved in their chemical compositions and in their structures evidence concerning processes that occurred in the nebulae 4.5 Ga ago. The chondrites that were not metamorphosed, however, preserve much information about the earliest history of the nebula and are worthy of intense, long-term study. By studying them we can attempt to infer the times and places at which the various chondrite group formed and the conditions present at each of these places.