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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| Absorption Coefficient |
A measure of the ability of a material to absorb radiation that passes through it. A high absorption coefficient indicates that the material absorbs radiation effectively. The absorption coefficient may depend strongly on the wavelength of the radiation, the temperature and other physical conditions.
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