There’s a super-massive black hole at the centre of the Milky Way, and it’s four million times heavier than our Sun.
“Although we think of black holes as somehow threatening, in the sense that if you get too close to one you are in trouble, they may have had a role in helping galaxies to form – not just our own, but all galaxies.” They had a role in bringing matter together and if you had a high enough density of matter then you have the conditions in which stars could form.Thus the first generation of stars and galaxies could have come into existence”.
More super-massive thoughts over at the BBC