3C 20
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3C 20 is a radio galaxy[1] located in the constellation Cassiopeia. It is one of largest known galaxies with a diameter of Script error: No such module "convert"..Template:Efn The galaxy features a prominent double hotspot in its eastern lobe. An unusually low fraction of the flux lies within the radio core, which is suggested to be caused by a combination of factors, including jet orientation, synchrotron self-absorption and aging, as well as interactions with surrounding gas and dust.[2]
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