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 Star |
An expression used in the early years of radio astronomy when the resolution of observations was too poor to enable astronomers to match radio sources to visible objects. It was assumed, quite wrongly, that many of these sources were stars; subsequently many were shown to be radio galaxies. True radio stars are very rare.
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