Astronomers using NASA's Hubble Space Telescope have discovered a ghostly ring of dark matter that formed long ago during a titanic collision between two galaxy clusters. The ring's discovery is among the strongest evidence yet that dark matter exists."This is the first time we have detected dark matter as having a unique structure that is different from both the gas and the galaxies in the cluster," said astronomer James Jee of Johns Hopkins University. Jee is a member of the team that spotted the dark matter ring.
The ring, which measures 2.6 million light-years across, was found in the cluster CL0024+17, located 5 billion light-years from Earth. link
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