Like so many objects of astronomi- cal interest, 3C 75ΓÇÖs seemingly arbi- trary name is connected to its history. Cambridge University con- ducted one of the early complete surveys of radio sources in the sky (published in 1959). Since it was the third of their studies, the catalogueΓÇÖs entries were prefixed with ΓÇ£3CΓÇ¥ and were sequentially numbered. Astronomical sources are generally identified by the nomenclature associated with their discovery. So one can infer that 3C 75 was discovered as a radio source before it was identified as a galaxy. Similarly, the cluster Abell 400 in which 3C 75 lies was named after the late astronomer George Abell whose studies of galaxy clusters form the foundation of our understanding of the large-scale structure of the universe.
