For every action, there is an equal and opposite reaction. Newton's third law. Sod the high road.
Madness string 101888
In 2009, researchers found a cluster of galaxies moving at an extraordinary speed towards a small patch of sky between the constellations of Centaurus and Vela. Some unknown force is tearing away chunks of the galaxy, and astronomers still have no clue what exactly is causing it. It's been named 'Dark Flow.'