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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| Invariable Plane |
The plane that includes the centre of mass of the solar system and is at a right angle to the angular momentum vector i.e. the spin axis of the solar system. This plane is the fundamental reference plane in computations of the dynamics of the solar system.
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