英和和英

出典:『Wikipedia』 (2011/06/03 18:44 UTC 版)

英語による解説

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Interstellar ice consists of grains of volatiles in the ice phase that form in the interstellar medium. Ice and dust grains form the primary material out of which the Solar System was formed. Grains of ice are found in molecular clouds, where new stars are formed. These ices are dominated by water, methanol, ammonia, carbon monoxide and carbon dioxide. Frozen formaldehyde and molecular hydrogen may also be present. Also present, but in lower abundances, are nitriles, ketones, and esters. The mantles of interstellar ice grains are generally amorphous, only becoming crystalline in the presence of a star.