Photo: Dark Matter Ring Detected by Hubble

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This composite image taken by the Hubble Space Telescope shows a ghostly "ring" of dark matter in the galaxy cluster Cl 0024+17. Astronomers say that the dark ring was produced from a collision between two gigantic clusters and is the best evidence yet for the existence of dark matter.

Image courtesy NASA, ESA, M.J. Jee and H. Ford (Johns Hopkins University)

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