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Sources:
http://hyperphysics.phy-astr.gsu.edu/hbase/forces/isq.html
https://www.eso.org/sci/publications/messenger/archive/no.124-jun06/messenger-no124-30-31.pdf
http://www.newscientist.com/article/dn8471-milky-way-feels-tug-of-largest-mass-in-the-universe.html#.U0aqfvmSzmc
https://www.cfa.harvard.edu/~dfabricant/huchra/seminar/lsc/
http://www.nasa.gov/mission_pages/hubble/science/great-attractor.html
http://csep10.phys.utk.edu/astr162/lect/gclusters/attractor.html
http://cow.physics.wisc.edu/~ogelman/guide/gr8a/
http://irfu.cea.fr/cosmography
http://www.atlasoftheuniverse.com/superc/shapley.html
http://www.ifa.hawaii.edu/info/press-releases/kocevski-1-06/
https://astronomy.swin.edu.au/cosmos/Z/Zone+Of+Avoidance