My understanding is that if for example one object is orbiting another, then the mass center of the two masses is located somewhere in between the two objects. And if we have many object (for example stars), then the mass center of the total system can be located another place than were any star is located. My question is then whether it is possible that in the milky way that the total center of all the masses is located another place than where the geometrical center is located. And if so then isn't it possible that the center of the milky-way is not Sagittarius A, but for example some visible star? And wouldn't it be possible to explain the apparent existence of black holes such as Sagittarius A, as the phenomena that the total center of masses and therefore the center to where (smaller) masses are attracted, can be located at another place than were any physical visible stars are located? And if so wouldn't that mean that a small object could be attracted to different non physical centers depending on where in fx. the milky way it is? And wouldn't that explain why there appears to be black holes attracting surrounding masses around the universe?