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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| Orthoscopic Eyepiece |
A good general-purpose telescopic eyepiece, giving a high-quality image and good eye relief. There are various forms, but the eyepiece typically consists of a convex or planoconvex eyelens with an achromatic triplet as the field lens.
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