Dark Flow

A few years ago, scientists discovered galaxy clusters that were moving together in the same direction at more than 2.2 million miles an hour. 

All known mass distribution models of the universe could not account for this phenomena and so, the group of scientists proposed that gravity from unknown matter beyond the known universe was attracting these galaxy clusters. 

Kashlinsky speculates that the dark flow extends “all the way across the visible universe,” or about 47 billion light-years, which would fit with the notion that the clusters are being pulled by matter that lies beyond known horizons.

Dark flow, he said, “would be much more difficult to explain theoretically if it extended [2.5 billion light-years] and then just stopped.”

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