Dark flow
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Dark flow is a perceived anomaly in the gravitation of several galactic clusters, centring between the constellations of Centaurus and Vela. While the motions of galaxies are believed to be more or less randomly distributed with respect to the cosmic microwave background a peculiar force seems to be pulling a particular cluster in the same direction at similar speeds. This anomaly cannot be accounted for by the general expansion of the universe and appears as if something outside and beyond our universe is pulling these clusters together.