Scientists detect cosmic 'dark flow' across billions of light years
Tuesday, September 23, 2008 - 12:42
in Astronomy & Space
(PhysOrg.com) -- Using data from NASA's Wilkinson Microwave Anisotropy Probe (WMAP), scientists have identified an unexpected motion in distant galaxy clusters. The cause, they suggest, is the gravitational attraction of matter that lies beyond the observable universe.