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Published online 15 May 2007 | Nature | doi:10.1038/news070514-6
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Dark matter has a ring of truth
A distant cluster of galaxies contains a hoop of the elusive dark stuff.
A ghostly ripple spotted within a cluster of galaxies 5 billion light years away supplies further evidence that the mysterious substance known as dark matter really exists.
An international team of astronomers says that the galactic cluster C1 0024+17 contains a ring of dark matter 2.
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