Inverse problems are basic problems in science, in which physical systems are to be identified on the basis of experi¬mental observations. Inverse problems are especially impor¬tant in the fields of astrophysics and astronomy, for their objects of investigation are frequently not observable in a direct fashion. Solar and stellar structure, for example, is estimated from the study of spectra, while the structure of a planetary atmosphere may be deduced from measurements of reflected sunlight.
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