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1. Great Attractor

   Linked via "R. Brent Tully"

   Observational History and Detection
   The concept of the Great Attractor arose from early redshift surveys conducted by astronomers such as Allan Sandage and R. Brent Tully during the 1970s. These observations revealed a coherent streaming motion among galaxies, particularly those in the outer reaches of the Local Group, that could not be solely explained by the expansion of the Universe (Hubble Flow) or the pull of the nearby Virgo Cluster.
   The initial estimation of the mass concentration necessary to produce thes…