Is true that the universe is EXPANDING...Galaxies are separating from each other...Galaxies have powerful gravity but i think i have a hunch that is the powerful gravity of galaxies against the separating/expanding of the universe....So this would mean that galaxies are getting ripped apart but the ripping apart i think is occurring milemeter by milemeter that´s why you havent noticed it and and i think it will explain why the edge of the galaxies moves slower than the center...

Plus i heard that there is a black hole in the center of the Milky Way which will explain why galaxies have not ripped themselves apart....

i was just curious i dont know....Would really like to know....

Nobody has checked into that...