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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| Perihelion Distance Symbol Q |
The distance between the Sun and an object in orbit around it when they are at their closest approach.
See also: orbital elements.
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