1 Lecture, 2 September 1999

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چکیده

Virtually all of our knowledge of astronomical objects was gained by observation of their light. We know how to make many kinds of detailed measurements on light, among them brightness, spectrum, polarization state, degree of coherence, and the shape of light-emitting regions. We also know a great deal about the mechanisms by which light can be produced in nature, and we can thus use any accurate measurements we can obtain on light to characterize the physical state of astronomical objects.

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تاریخ انتشار 1999