Space exploration began with the launch of Sputnik and Astrophysics was born as the application of physics to the phenomena observed by Astronomy, which etymologically means laws of the stars.
There are 2759 entries in this glossary.| Term | Definition |
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| Reversing Layer |
The outermost layers of a star in which the absorption lines are presumed to be impressed on the continuous spectrum of the hotter gas beneath. The idea of a reversing layer is, however, an oversimplification since both emission and absorption take place through all the layers of a stellar atmosphere.
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