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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| Absolute Luminosity |
A measure of the actual rate of energy output of a star or other celestial object as opposed to the apparent luminosity, which depends on the distance to the object.
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