Interstellar ices

Physics

Scientific paper

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Scientific paper

Infrared observations made with ground-based and space (ISO, Spitzer) telescopes reveal the main ice constituents in the interstellar medium to be water, CO, CO_{2} and NH_{3} with small additions of more complex species. Variations of ice structure and composition between protostellar objects of different evolutionary stages have also been discovered. Laboratory studies of ice analogs give important information about the structure of ices and the kinetics of ice chemistry. Numerical modeling of ices based on laboratory data and theoretical predictions provides a qualitative explanation of observations, and predictions of further ice evolution and their role in the formation of complex prebiotic species - the possible precursors of life.

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