A distant cluster of galaxies contains a hoop of the elusive dark stuff.
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References
Jee M. J., et al. Astrophys. J., (in the press).
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Ball, P. Dark matter has a ring of truth. Nature (2007). https://doi.org/10.1038/news070514-6
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DOI: https://doi.org/10.1038/news070514-6