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physical object > natural object > celestial body > collection of stars > galaxy > radio galaxy > double radio source
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double radio source comparison table
Subject has volume has catalog has number of star has momentum has spectra has material has velocity has mass has extent has angular momentum has definition is part of has location has synonym has wavelength has temperature is an instance of
Cygnus A galaxy catalog106 to 1012       A double radio source, the third strongest radio source in the sky (after the Sun and Cas A), at one time believed to be caused by the collision of two galaxies. It has now been identified with a distant peculiar cD galaxy (z ≈ 0.056).celestial sphereor center of gravity2U 1957+40X-ray X-ray source

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