As scientist gaze out to the edge of the observable universe, they've noticed over 1000 galaxy clusters racing at 621 miles per second toward a single point. Why? Astronomer Laura Mersini-Houghton of the University of North Carolina thinks all those galaxies are racing toward another universe located next to ours.
"If the tiny patch of vacuum that inflated to become our universe was quantum entangled with other pieces of vacuum - other universes - they could have exerted a force from beyond the present-day visible horizon."
Many scientists disagree, saying there's no evidence for this so-called "dark flow." But this largest analysis yet of those 1000 galaxies flinging themselves out into the unknown says there is something big out there. If it's not another universe, what could it be?