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.
Read more http://www.csmonitor.com/Science/2013/0104/What-s-going-on-around-Andromeda-Curious-structure-puzzles-scientists
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