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Milky Way Should Have Much More Companionship

9 May 2011, 16:05 UTC
Milky Way Should Have Much More Companionship
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Dark matter. Nobody knows what it is, but it's thought to make up a quarter of the universe. If that's so, theory predicts that thousands of dark matter clumps should surround the Milky Way, each holding a small satellite galaxy. [More]

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