Q&A: Milky Way Galaxy
I have heard that the Andromeda Galaxy and the Milky Way Galaxy may end up colliding with each other in the future. What will happen to these two galaxies if this collision occurs?
The motions of the stars in the original spiral galaxies are radically changed by a galactic collision, and eventually a large elliptical galaxy should form. This process is believed to have taken place a few billion years ago in NGC 4261. This large elliptical galaxy shows no trace of its violent history in optical images, but Chandra observations are thought to show remnants of a galactic collision.