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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| Radius Vector |
The line joining an orbiting body to its centre of motion at any instant, directed radially outwards. For a circular orbit, the centre of motion coincides with the centre of the circle; for a parabolic or hyperbolic orbit, the centre of motion is the focus, and for an elliptical orbit it is one of the two foci.
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