I did not create this image; I am merely reposting it to be more accessible to others. The image was found on Wikimedia Commons. It was labeled as a public domain image because it is a NASA image. I provide it here as a stock/resource image. If you decide to use this image, please give credit to NASA.
Have fun with it!
Collisions between galaxies are extremely slow and relatively unchaotic compared what one may think. Such collisions take hundreds of millions of years to die down. While the stars jostle each other with their gravity, few if any would actually collide. Planets, on the other hand, would be thrown off course, either being flung into interstellar or tossed into a collision course with a star. After large galaxies merge, they form into a an even larger elliptical galaxy. In a few billion years, our own Milky Way galaxy and the Andromeda galaxy will suffer the same fate as the galaxies in this image.