Why is there a black hole at the centre of every large galaxy?
To answer this question I will have to get back to the basics of this question. Black holes are a collapsed star with a very large gravitational pull. What ever they suck in stays in and adds the the mass of the black hole. The reason why there is a black hole at the center of every galaxy is not because it was put there, but because the galaxy was formed around the black hole. Everything in the galaxy is trapped inside of the gravitational pull of the black hole. This is why there is a black hole at the center of every large galaxy. By the way, there is a black hole at every galaxy, not just at the center of large galaxies.
