Spiffy!

New evidence for dark matter:

A team of scientists say they have found the most convincing evidence so far that the mysterious stuff known as dark matter really exists: a gigantic ring of invisible material left over from the ancient collision of galaxy clusters.

Researchers using the Hubble Space Telescope stumbled on the ring — about 2.6 million light years across — while studying the galaxy cluster CI 0024+17, which is about 5 billion light years from Earth.

Although scientists have found evidence of dark matter previously, this is the first time dark matter has been found to assume a structure different from the surrounding visible matter.

...

Previous observations of the Bullet Cluster, 3.4 billion light years away in the constellation Carina, using Hubble and the orbiting Chandra X-Ray Observatory showed dark matter being pulled apart by the hot gas of the two clusters. But the dark matter was imprinted with the shape of the visible matter.

The dark matter ring in CI 0024+17 does not follow any of the cluster's contours.