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Home > Art, Film & Photography > Great Attractor: Norma Cluster, Shapley Supercluster
Great Attractor: Norma Cluster, Shapley Supercluster

Great Attractor: Norma Cluster, Shapley Supercluster


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About the Book

Chapters: Norma Cluster, Shapley Supercluster. Source: Wikipedia. Pages: 22. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: The Great Attractor is a gravity anomaly in intergalactic space within the range of the Centaurus Supercluster that reveals the existence of a localised concentration of mass equivalent to tens of thousands of Milky Ways, observable by its effect on the motion of galaxies and their associated clusters over a region hundreds of millions of light years across. These galaxies are all redshifted, in accordance with the Hubble Flow, indicating that they are receding relative to us and to each other, but the variations in their redshift are sufficient to reveal the existence of the anomaly. The variations in their redshifts are known as peculiar velocities, and cover a range from about +700 km/s to -700 km/s, depending on the angular deviation from the direction to the Great Attractor. 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, and is situated at a distance of somewhere between 150 and 250 Mly (million light years) (47-79Mpc) (the latter being the most recent estimate) from the Milky Way, in the direction of the Hydra and Centaurus constellations. 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 the region of space is dominated by the Norma cluster (ACO 3627), a massive cluster of galaxies, containing a preponderance of large, old galaxies, many of which are colliding with their neighbours, and/or radiating large amounts of radio waves. In 1992, much of the apparent s...More: http: //booksllc.net/?id=17743


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Product Details
  • ISBN-13: 9781158692736
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • Sub Title: Norma Cluster, Shapley Supercluster
  • Width: 229 mm
  • ISBN-10: 1158692730
  • Publisher Date: 16 Sep 2010
  • Binding: Paperback
  • Spine Width: 2 mm
  • Weight: 50 gr


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