Ghostly ring provides strong evidence for dark matter

A ring-shaped distribution of mass in a galaxy cluster five billion light-years from Earth is the strongest evidence yet for the existence of dark matter. This is the claim of physicists from the US and Europe, who have used data from NASA's Hubble Space Telescope to see how gravity is bending the light around the cluster. Unlike previous searches in other galaxy clusters, this would be the first time dark matter has been seen isolated in its own separate structure.

See PhysicsWeb.