Thread:Comments:Scientists conclude that the universe may expand forever/Curses!/reply (2)

The expansion of the universe becomes noticeable only on a scale way larger than the one of a galaxy (at least one hundred million light-years, one thousand times the size of the Milky Way). It has very little or no influence on local dynamics. In fact the collision between our galaxy and Andromeda will happen in a few billions of years (three billion or something approaching, the Sun will still exist at that time), but it has nothing to do with the expansion of the universe.