They will form a larger galaxy. For example Milky way and Andromeda galaxy are on a colliding course (previous post). Usually big spiral galaxies have supermassive black holes at their center. Most of the stars will interact, but there won't be star collision since the concentration is so low. Galaxies will go into the spiraling dance - two black holes will be on a merger course - disturbing the material and reorganizing it into elliptical galaxy. :) there are few simulations about it - very nice to watch. )
You are viewing a single comment's thread from: