| 单词 | radio galaxies |
| 释义 | radio galaxies A radio source outside the Galaxy that has been identified with an optically visible galaxy. These radio galaxies are distinguished from normal galaxies by having a radio power output some 106 times greater (i.e. up to 1038 watts rather than 1032W). The source of the radio-frequency energy is associated with violent activity, involving the ejection of relativistic jets of particles from the nucleus of the galaxy. It has been suggested that the sources are powered by supermassive black holes in the nucleus |
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