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 |
|---|---|
| Defect Of Illumination |
The proportion of the disc of a planetary body, measured as an angle, that is not illuminated as viewed by an observer on Earth.
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