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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| Naked-Eye Star |
A star visible in principle without the aid of a telescope. In principle, stars down to about sixth magnitude are visible to the naked eye under ideal conditions, but this is rarely achieved in practice except on moonless nights under transparent skies remote from artificial illumination.
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