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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| Ras Algethi Alpha Herculis; α Her |
The brightest star in the constellation Hercules. It is a binary, consisting of a red supergiant M star with a sixth magnitude companion of spectral type F, which appears greenish in contrast. The secondary is itself a spectroscopic binary. The primary star is an irregular variable, its magnitude ranging between 3 and 4. The name, of Arabic origin, means the kneeler’s head.
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