How does the collision between large spiral galaxies typically proceed, given the immense spacing between individual stars?

Answer

A prolonged gravitational dance involving tidal stripping and multiple interactions.

Galactic collisions are not direct stellar impacts due to vast interstellar distances; rather, they involve tidal forces stripping gas and dust, fueling star formation, and settling into a single structure after several close gravitational swings.

How does the collision between large spiral galaxies typically proceed, given the immense spacing between individual stars?

#Videos

If the Universe is expanding, then why do galaxies collide? - YouTube

Spacegalaxiesastronomyuniversemovementcosmologyexpansion