A distant cluster of galaxies contains a hoop of the elusive dark stuff.
A ring of darkness, inferred by looking at how the starlight coming from galaxies behind it is bent.
Credit: NASA, ESA, M.J. Jee and H. Ford (Johns Hopkins University)
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
