From Space.com:The puzzling migration of matter in deep space – dubbed "dark flow" – has been observed at farther distances than ever before, scientists have announced.
Distant galaxy clusters appear to be zooming through space at phenomenal speeds that surpass 1 million mph. The clusters were tracked to 2.5 billion light-years away – twice as far as earlier measurements.
This motion can't be explained by any known cosmic force, the researchers say. They suspect that whatever's tugging the matter may lie beyond our observable universe.
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