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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| Rigel Beta Orionis; β Ori |
The brightest star in the constellation Orion. Its Bayer letter is Beta, despite the fact that, at magnitude 0.1, it is slightly brighter than Betelgeuse, which is designated Alpha. Rigel is a supergiant B star, with a seventh magnitude companion. The name, derived from Arabic, means leg of the giant.
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