The term "photosphere" can refer to different concepts depending on the context, but it is most commonly associated with astronomy and photography. 1. **Astronomy**: - In the context of astronomy, the photosphere is the visible surface of a star, most notably the Sun. It is the layer from which light is emitted and is typically about 400 kilometers thick.
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The photosphere is the layer from which most observed stellar radiation escapes; in a grey atmosphere it is represented approximately by optical depth .