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What’s going on around Andromeda? Curious structure puzzles scientists
Posted By admin On January 5, 2013 @ 4:52 am In Sci Tech | Comments Disabled
The Christian Science Monitor 
January 5, 2013
Thirteen dwarf galaxies are playing a cosmic-scale game of Ring Around Andromeda, forming an enormous structure astronomers have never seen before and are hard-pressed to explain with current theories of how galaxies form and evolve.
According to current theories, the small galaxies, which contain as many as a few tens of billions of stars each, should be randomly arranged around the Andromeda galaxy .
Instead, they orbit Andromeda within a plane more than 1 million light-years across and about 30,000 light-years thick. For comparison, the latest estimates of Andromeda’s girth put its diameter at more than 220,000 light-years.
The ring, if it can be called that, represents “the largest organized structure in what we call the local group of galaxies,” says Michael Rich, a research astronomer at the University of California at Los Angeles  and a member of the team reporting the results in the Jan. 3 issue of the journal Nature . The local group consists of more than 54 galaxies, including dwarfs, about 10 million light-years across.
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URLs in this post:
 The Christian Science Monitor: http://www.csmonitor.com/Science/2013/0104/What-s-going-on-around-Andromeda-Curious-structure-puzzles-scientists
 Andromeda galaxy: http://www.csmonitor.com/tags/topic/Andromeda+Galaxy
 University of California at Los Angeles: http://www.csmonitor.com/tags/topic/University+of+California-Los+Angeles
 journal Nature: http://www.csmonitor.com/tags/topic/Nature+Publishing+Group
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