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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| Kellner Eyepiece |
A type of telescopic eyepiece with a planoconvex field lens and an achromatic doublet as an eyelens. It is generally regarded as a good all-purpose eyepiece and is widely used.
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