Do supermassive black holes cause galaxy rotation?
If a black hole is in the center of our galaxy, could it be the source of the rotation of the galaxy and if so, if it is acreeting matter could this mean that it is getting more and more massive? whouldnt this imply that the rotation is getting faster and finally could this mean that a galaxy year is getting shorter even if its just a little bit? The nice thing about black holes is that although they distort space and time quite severely in their vicinity, their gravitational influence on distant objects is just as we would expect for “normal matter”. How far away is “distant” for black holes? We characterize the size of a black hole in terms of its Schwarzchild Radius, or the radius within which gravity is so strong that not even light can escape. A good rule to remember is this: for a black hole of mass “M” times the mass of the Sun, its size is 3xM measured in kilometres (km). So, a solar mass black hole has a Schwarzchild Radius of about 3 km. As a rough estimate, let’s say that th
