Rascal ... Yes ... there are some bastard galaxies from our point of view. At present the milky way is colliding with another galaxy, a smaller one. I think it may be Hydra. But it is far from the arm that we are on.
Not everything in the Wikipaedia is correct. It lists Andromeda approaching us, or us approaching it, at around 140 klm /sec. I am fairly sure
this is incorrect and the true figure according to the blue-shift of light is 310 klm/sec. This is a radial velocity and takes no account of lateral motion, only the average of 'as the crow flies'
The Milky Way and Andromeda are considered a binary system locked together in a spiral Death Dance. They are the two major galaxies in 'The Local Group' cluster which itself is part of a larger Super Cluster called the Virgo Super Cluster.
They will most likely collide in a few billion years, but with Einsteins Theory of General Relativity and as distance in space can be rather meaningless except between the two objects concerned this is a fairly loose prediction.
cool bananas ... greg (thanks for the thanks ...
)