The DARK side of matter

''Space telescopes have captured images of a mammoth collision between two galaxy clusters that have shed some light into the universe's mysterious dark matter, NASA said.

The images taken by the Hubble Space Telescope and Chandra X-ray Observatory show a clear separation between dark and ordinary matter during the clash 5.7 billion light-years from Earth, the U.S. space agency said Wednesday.''

Article here.

(A non-related but cool picture)