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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| Hartmann Test |
A test for the optical quality of a mirror. The mirror is covered with a screen in which there is a pattern of regularly spaced holes. The quality of the mirror can be judged from the image produced in the focal plane.
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