(3C 405, QSO B1957+405)
(early-discovered radio galaxy and quasar)
Cygnus A (i.e., 3C 405 or QSO B1957+405)
is a radio galaxy and quasar, one of the first of
each to be identified. As a radio source, it was discovered
by Grote Reber in 1938, with his back-yard radio telescope,
the first radio receiver built for that purpose.
It demonstrates the involvement of jets in
creating a radio galaxy's radio emissions,
showing the strong radio single comes from two regions
in opposite directions from the galaxy itself.
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