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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| Sagittarius A |
The overall name for the complex radio source associated with the galactic centre. It is composed of at least four separate sources, known as Sagittarius A, B, B2 and C. A bright, compact source known as Sagittarius A* is believed to be the closest to the actual centre of the Galaxy.
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