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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| Mean Motion |
The constant angular speed that would be required for a body travelling in an undisturbed elliptical orbit of specified semimajor axis to complete one revolution in the actual orbital period. It is thus the angular speed a body would have if it were following a circular orbit with a radius equal to the semimajor axis of its actual elliptical orbit.
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