Chemicals Basic to Life Found Plentiful in Space
W Sullivan discusses recent discoveries by astronomers that chems basic to life exist abundantly in far reaches of Milky Way Galaxy and subsequent theory that such chem ferment probably represents initial stage in evolution of stars, planets and, ultimately, of life; Univ of Chicago scientists, Drs E Anders and R Hayatsu, and Argonne Natl Laboratory scientist Dr M H Snider theorize that key factor in chem evolution in deep space during final stages in formation of new star and planetary system is similar to Fischer-Tropsch synthesis used in Germany during World War II to synthesize gasoline, in which intermediate substances or catalysts facilitate assemblage of complex molecules; hypothesis has been advanced to account for extraordinary variety of organic substances found in certain meteorites known as carbonaceous chondrites; such objects have yielded amino acids from which proteins are constructed, as well as purines and pyrimidines--substances of type that form key chems of life such as DNA; scientists further suggest that in formative stage of solar system such substances as magnetite and hydrated silicates served as catalysts; among telltale radio emissions detected from within far reaches of Milky Way by astronomers are those of formaldehyde (precursor to sugars), hydrocyanic acid (which can develop into purines) and cyanoacetylene (precursor to pyramidines); scientists who have observed molecules assert that their formation cannot depend on random collisions between atoms, and that age of entire universe would not provide enough time to account for synthesis of material in this manner; some theories pertaining to chem synthesis discussed