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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| Period-Luminosity Relation |
The relationship between the absolute luminosity and the period of variability of Cepheid variable or W Virginis stars.
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