The major surprise about Cygnus A, one of the first three sources of strong radio emission detected by Grote Reber in the late 1930s, when examined with large optical telescopes, was that it

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Cygnus A was a major surprise because it was a very distant object that appeared relatively faint when observed with optical telescopes, yet it was extremely luminous at radio wavelengths, indicating a powerful source of radio emissions not correlated with its optical brightness.

The Major Surprise About Cygnus A, One of the First