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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| Galilean Telescope |
A simple telescope design, of the kind used by Galileo in the first astronomical telescopes, consisting of two lenses. A long-focus convex converging lens forms the objective and a single concave lens is used as the eyepiece. The resulting image is upright, and the system is still widely used in opera-glasses.
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