The Role of Dark Matter in the Formation of Galaxies

Every galaxy has a huge dark matter halo around it, like the Milky Way is about 100,000 light years across. As these supermassive black holes leave the galaxies, they can increase their dark matter fraction. We think we'll probably fall into the center of the galaxy because eventually it's like dynamical friction. Our star will get pushed by other stars on all that jostling and ends up kicking somebody towards the center of our galaxy.