What’s going on around Andromeda? Curious structure puzzles scientists.

By The Christian Science Monitor
Saturday, January 5, 2013 1:18 EDT
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Andromeda via NASA
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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…

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