Researchers, led by Hebrew University of Jerusalem’s Professor Yehuda Hoffman, have used 3D mapping of the movement of galaxies, to find that our Milky Way galaxy is speeding away from a huge, previously unidentified low density void that they have named the Dipole Repeller.

http://www.wired.co.uk/article/dipole-repeller-milky-way  https://vimeo.com/189355968

http://www.nature.com/articles/s41550-016-0036