Abstract
This article discusses chemical composition and origin of solids including refractories, ices, and organics in the solar system and interstellar clouds as viewed from the condensation theory, and examines effectiveness and limitation of the equilibrium condensation theory. It is pointed out that, by taking cometary volatiles as a typical cosmic volatiles, the equilibrium condensation theory cannot be applied to low temperature condensation. Theories on the origin of cometary volatiles are discussed, and an observational clue to testing the theories is pointed out. Brief discussion is given on the advantage for formation of organic matter from volatile solids.
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