天体生物学与外展杂志

抽象的

Cosmo Chemistry

Chandra Shekhar Kapoor

In Meteorite classification attempts to document differences and linkages among meteorites a critical initiative because variations and trends among members of a gaggle can reveal the processes that produced them. In the first edition, 9 groups of chondrites, 4 groups of achondrites, 2 stonyiron groups, and 13 iron meteorite groups were recognized. Other anomalous meteorites (distinct individual specimens or groups having but five members) were also known. Since that time, new meteorites found in Antarctica and hot deserts have considerably expanded our collections, and a recent compilation of meteorites (including ungrouped samples, class in breccia’s, and micrometeorites) suggested that perhaps 135 asteroidal parent bodies could also be represented. This mostly neutral gas slowly began to collapse and about 30-50 million years after the large Bang massive holes formed.