... Galaxies Cluster Toward the Great Attractor . ... Galaxies dot the sky like jewels in the direction of a mass so large it is known simply as the Great Attractor. ... The Largest Rock Known . ... The Millennium that Defines Universe . ... During millennium two, humanity continually redefined its concept of "Universe": first as spheres centered on the Earth, in mid-millennium as the Solar System, a few centuries ago as the Galaxy, and within the last century as the matter emanating from the Big Bang. ...