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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| Nunki Sigma Sagittarii; σ Sgr |
The second-brightest star in the constellation Sagittarius. It is a B star of apparent magnitude 2.0.
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