Short form: Scientists have discovered evidence of a gravitational force, a "dark flow", that exists *outside of the universe* and affects all things within the universe, a "macro-gravity" if you will.
There's got to be a good sci-fi story seed in here somewhere.
They don't seem to be saying "outside" in the sense of "you could open a door to it here", though. More like the conventional way outside, where it's just further away than the edge of the known universe.