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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| Optical Depth Symbol τ |
A measure of the degree of absorption that takes place when electromagnetic radiation travels along a specified path through a gaseous or dusty medium, such as the atmosphere of a star or planet.
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