It is true that astronomers believe that the Milky Way is in a collision course with our neighbor, the Andromeda Galaxy. The thing that might be surprising is many galaxies collide with each other. This is not an overly unique event. With so many galaxies zooming around the Universe in relative close proximity with each other, collisions are inevitable and fairly common. To see some cool pictures of galaxies in collision go to the following website: http://apod.nasa.gov/apod/colliding_galaxies.html

NGC 4676: When Mice Collide
When you think about galaxies colliding with each other, it is not like two cars crashing into each other. The galactic collision takes place over millions and billions of years. Also when galaxies collide they don’t actually strike one another, they simply pass through each other. Few if any stars actually strike one another. For a really nice animation of two galaxies colliding, go to this website: http://www.haydenplanetarium.org/resources/ava/galaxies/G0601andmilwy.
Some astronomers calculate that the Milky Way – Andromeda collision may take place from 2 billion to 10 billion years from now. During the collision, the stars making up the two spiral galaxies would slowly meld into a more elliptical combo galaxy, “Milkomeda” or “Andromedy Way” (whichever you prefer). Although most of the stars would be too spread out to collide, each of the galaxies’ gravity would jostle the others’ stars.
Some astronomers feel that after the collision, the Sun may become a member of the Andromeda Galaxy instead of the Milky Way as they spread apart again. The estimates are tentative at best and, as one astronomer put it, fun to ponder.
For an interesting article about the Milky Way and Andromeda collision, read this website: http://www.sciam.com/article.cfm?id=when-milky-way-and-andromeda-collide-earth-could-find-itself-far-from-home.












