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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| Acrux Alpha Crucis; α Cru |
The brightest star in the constellation Crux. Appearing to the unaided eye as a white star of magnitude 0.9, it is a visual double, the two components being B stars of magnitude 1.4 and 1.9. The separation is 4.4 arc seconds.
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