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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| Focal Plane |
The surface on which fall the images of all points in the field of view of an optical instrument such as a telescope. This surface may be flat and normal to the optical axis or, as in the Schmidt telescope, curved, in which case the term focal surface is preferable.
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