While radio galaxies were often visible on optical photographs, back in the 1960s another type of radio source was found that appeared to have no optical counterpart. At the very best, astronomers might have noticed what appeared to be a star at the location of the radio source, but normal stars do not produce strong radio emissions. If those were stars they had to be a special class of objects and the name radio “star” was adopted, at least for a while, until one of the most amazing breakthroughs in the history of astronomy.


Radio Emission Radio Source Radio Galaxy Brightness Variation Radio Brightness 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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© Springer Science+Business Media, LLC 2007

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