The Universe may be billions of light years across i.e. it would take light, travelling at 186,000 miles per second, billions of years to travel from one end of the Universe to another. But that unimaginable expanse still does not prevent galaxies from occasionally colliding.
The amazing image of NGC 3256, part of the Hydra-Centaurus Super Cluster, shows two galaxies slowly colliding: two distinct nuclei or centers are visible. Swirling around the nuclei are intricate filaments of dark dust. Stars, unlikely to collide themselves, appear to have unusual tidal tails.
Gas, dust and ambient magnetic fields of the two galaxies do interact; it is quite possible that in a few hundred million years just one galaxy will remain.