what will happen if/when another galaxy collides with ours

Question

what will happen if/when another galaxy collides with ours

In: 11

Answer 1

At the level of individual stars, pretty much nothing. But at the level of all stars interacting with the collective gravity of the two galaxies, quite a lot. For example, the Mice galaxies:

https://en.m.wikipedia.org/wiki/Mice_Galaxies