"Several authors have shown that the local universe up to 300 MPc from the Milky Way is less dense than surrounding areas, by 15-50%."
"An earlier "Hubble Bubble" model, based on measured velocities of Type 1a supernovae, proposed a relative void centred on the Milky Way."
"The Local Void is surrounded uniformly by matter in all directions, except for one sector in which there is nothing, which has the effect of taking more matter away from that sector. The effect on the nearby galaxy is astonishingly large."