2014-09-03. The Laniakea supercluster of galaxies.

posted Sep 5, 2014, 8:59 PM by Alan Gould
For GSS A Changing Cosmos chapter 9. Abstract excerpt: Galaxies congregate in clusters and along filaments, and are missing from large regions referred to as voids. These structures are seen in maps derived from spectroscopic surveys that reveal networks of structure that are interconnected with no clear boundaries. Extended regions with a high concentration of galaxies are called ‘superclusters’, although this term is not precise. ...We define a supercluster to be the volume within such a surface, and so we are defining the extent of our home supercluster, which we call Laniakea....   http://www.nature.com/nature/journal/v513/n7516/full/nature13674.html. By  R. Brent Tully et al, Nature 513. See also article in Huffington Post - http://www.huffingtonpost.com/2014/09/05/laniakea-supercluster-galaxy-tully_n_5763274.html