Galactic Collision Outcomes
If a large galaxy was moving faster than another
close to it, and moving in the same direction, would the slower
and smaller galaxy soon crash into or follow closely due to the
gravity pull of the bigger galaxy?
Good question. If a small galaxy is orbiting a bigger one,
depending on the type of motion it might collide with the bigger
one. This seems to happen pretty commonly. Our Milky Way is
swallowing up some small galaxies, and may swallow its companions
someday, the Magellanic Clouds. It and its bigger neighbor
Andromeda may collide also in the future.
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Update: June 2012