Dark matter, dark energy and now dark flow: it seems we live in an increasingly darker universe, and the current teen fascination with vampires has nothing to do with it!
In 2008 scientists reported the discovery of hundreds of galaxy clusters streaming in the same direction at more than 2.2 million miles (3.6 million kilometers) an hour.
This mysterious motion can't be explained by current models for distribution of mass in the universe. So the researchers made the controversial suggestion that the clusters are being tugged on by the gravity of matter outside the known universe.
Now the same team has found that the dark flow extends even deeper into the universe than previously reported: out to at least 2.5 billion light-years from Earth.
John Roach @'National Geographic'
Here's the original paper in pdf:
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