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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| Achernar Alpha Eridani; α Eri |
The brightest star in the constellation Eridanus. The name, which is of Arabic origin, means the end of the river and the star marks the southern extremity of the constellation at a declination of -57°. Achernar is a B star of magnitude 0.5.
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