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Cygnus A
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<p>Cygnus A (<a href="/facts/Third_Cambridge_Catalogue_of_Radio_Sources/T5zYFDIz">3C</a> 405) is a <a href="/facts/Radio_galaxy/mya88npd">radio galaxy</a>, one of the strongest <a href="/facts/Astronomical_radio_source/FEJFMcI8">radio sources</a> in the sky. </p>