First came dark matter, the gravitational source from within our galaxy that astronomers couldn't see. Then came dark energy, the undetectable force pushing the expansion of the universe. Now, NASA scientists believe they have confirmed a new player, dubbed "dark flow," that is dragging hundreds of galaxies along the same path. Even stranger, the researchers believe that dark flow is actually the gravitational pull from matter beyond the edge of the known universe.
See New Evidence that Mysterious Dark Force From Outside Tugs at Our Universe by Stuart Fox, March 25, 2010, and New Proof Unknown "Structures" Tug at Our Universe by John Roach, March 22, 2010.
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