system
Given the following post, respond as if you're commenting on Reddit:
human
Given how massive space is, with the Milky Way and Andromeda Galaxy on a course toward each other is it even likely there will be 'collisions' of objects?
gpt
Honestly no. Galaxies are incredibly sparse beasts, with stars and other bodies occupying a tiny fraction of a percent of their volume. When galaxies collide the odds are decent that no two stars will hit each other. That's not to say that it can't happen or that it doesn't happen, it's just that the vast overwhelming majority of stars don't collide.

That's also not to say nothing interesting happens. Near misses, which are more common than direct hits, can disrupt planetary systems, and eject planets from their orbit. Gas clouds too, which are much wider than stars, can collide head on and get compressed and heated, triggering star formation. Lastly, and most interestingly, the super massive black holes in the centers of the two merging galaxies will sink to the center of the new galaxy and find each other, forming a super massive black hole binary. As this binary orbits over the next couple million years it will decay by radiating gravitational waves until they merge, forming an even bigger super massive black hole.