September 24, 2008
Physicists Discover ‘Dark Flow’ Motion
Scientists using data from the U.S. space agency's Wilkinson Microwave Anisotropy Probe have identified an unexpected motion in distant galaxy clusters.
National Aeronautics and Space Administration researchers say the cause of the motion might be the gravitational attraction of matter that lies beyond the observable universe.
Kashlinsky calls the collective motion "dark flow" in the vein of more familiar cosmological mysteries such as dark energy and dark matter. "The distribution of matter in the observed universe cannot account for this motion," he said.