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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| Radio Source |
Any natural source of cosmic radio emission. In cosmology, it has a more restricted meaning and refers only to radio galaxies and quasars.
See also: radio astronomy, source counts.
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