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Cheers Ben - Stephan's Quintet was the first ever discovered compact galaxy group, by Eduard Stephan from the Marseilles Observatory in 1877. The group was at the core of the great redshift controversy in the 1970s. The redshift of NGC 7320 is much lower than that of the other galaxies in the group. One side of the controversy argued that as this was obviously a physical group, redshift did not indicate distance, whilst the other side argued that the same evidence proved that NGC 7320 is just a foreground object. The latter argument prevailed, eventually.
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