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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| Yagi Antenna |
An antenna for receiving radio waves, consisting of a small number of parallel dipoles. The commonest domestic television aerials are of this type. Arrays of Yagis are used in radio astronomy to construct cheap aperture synthesis telescopes for sky survey work.
See also: radio telescope.
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