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Distant X-ray source
Answer for the clue "Distant X-ray source ", 12 letters:
radio galaxy
Word definitions for radio galaxy in dictionaries
Wikipedia
Word definitions in Wikipedia
Radio galaxies and their relatives, radio-loud quasars and blazars , are types of active galaxy that are very luminous at radio wavelengths , with luminosities up to 10 W between 10 MHz and 100 GHz. The radio emission is due to the synchrotron process . ...
Wiktionary
Word definitions in Wiktionary
alt. (context astronomy English) Type of galaxy that is very luminous at radio wave. n. (context astronomy English) Type of galaxy that is very luminous at radio wave.