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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| Beamwidth |
The angular extent of the beam of a radio telescope. The half-power beamwidth is the angular extent over which the power received is at least half the maximum measured when the radio telescope points directly at a point source. It gives a measure of the resolving power of the antenna.
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