Editing Great Attractor (section)

==Location==
The first indications of a deviation from uniform expansion of the universe were reported in 1973 and again in 1978. The location of the Great Attractor was finally determined in 1986: It is situated at a distance of somewhere between 150 and 250&nbsp;Mly (million light-years) (47–79&nbsp;[[megaparsec|Mpc]]), the larger being the most recent estimate, away from the [[Milky Way]], in the direction of the constellations [[Triangulum Australe]] (The Southern Triangle) and [[Norma (constellation)|Norma]] (The Carpenter's Square).<ref>{{cite web |url=https://www.nasa.gov/mission_pages/hubble/science/great-attractor.html |title=Hubble focuses on "the Great Attractor" |publisher=[[NASA]] |date=2013-01-18 |access-date=2020-10-24 |df=dmy-all}}</ref> While objects in that direction lie in the [[Zone of Avoidance]] (the part of the night sky obscured by the Milky Way galaxy) and are thus difficult to study with visible wavelengths, X-ray observations have revealed that region of space to be dominated by the [[Norma Cluster]] (ACO&nbsp;3627),<ref>{{cite book |doi=10.1007/3-540-45371-7_8 |chapter=Galaxies behind the Milky Way and the Great Attractor |title=From the Sun to the Great Attractor |volume=556 |pages=301–344 |series=Lecture Notes in Physics |year=2000 |last1=Kraan-Korteweg |first1=Renée C. |publisher=Springer |location=Berlin, Heidelberg |isbn=978-3-540-41064-5 |citeseerx=10.1.1.338.3806|s2cid=14507443 }}</ref><ref>{{cite web |url=http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/990924a2.html |archive-url=https://web.archive.org/web/20030218093933/http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/990924a2.html |archive-date=February 18, 2003 |series=NASA's Ask an Astrophysicist |title=The Great Attractor |first1=Koji |last1=Mukai |first2=Rich |last2=Mushotzky |first3=Maggie |last3=Masetti |df=dmy-all |quote=It is now thought that the Great Attractor is probably a supercluster, with Abell&nbsp;3627 near its center.}}</ref> a massive cluster of galaxies containing a preponderance of large, old galaxies, many of which are [[galaxy collision|colliding with their neighbours]] and radiating large amounts of [[radio wave]]s.