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 |
|---|---|
| Object Glass Og |
An old term for the objective lens of a refracting telescope. Its abbreviation, OG, is still often used when observations are recorded, to signify that the telescope used was a refractor.
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