Cygnus A, a Strong Radio Source, Is Also Designated 3C

question 54

Multiple Choice

Cygnus A, a strong radio source, is also designated 3C 405. What does the "3C" stand for?

• A) "3C" stands for the Third Cambridge Catalog, an important list of radio sources.
• B) This radio source is a Type 3C radio source as opposed to a Type 1A or a Type 2B.
• C) Cygnus A was discovered through a joint program run by Cambridge, Connecticut, and Calgary universities.
• D) A chopper is a device needed to cut off and delineate a signal from a source, and three such choppers are required to isolate an intelligible signal from Cygnus A.

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