Bok
09-14-2011, 07:27 PM
The lovely, familiar swirl of the Milky Way, with its symmetric spiral arms winding outward from a central bulge, may be scars from a smaller galaxy punching above its weight. A new computer re-enactment of billions of years of galactic evolution suggests that the Milky Way owes much of its current shape to interactions with a nearby dwarf galaxy. [More] (http://www.scientificamerican.com/article.cfm?id=sagittarius-satellite-spiral)
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