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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| Galactic Plane |
The great circle on the sky that includes the galactic centre and the densest parts of the Milky Way. It is inclined at about 63° to the celestial equator.
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