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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| Eye Relief |
The distance between the surface of the eyelens of an eyepiece and an observer’s eye when the observer is positioned to see clearly the full field of view. In general, the higher the power of the eyepiece, the lower the eye relief.
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