Quote:
Originally Posted by arjaybe
The Milky Way is moving at about one-fifth of one percent of the speed of light.
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You do not give what frame of reference you are using in stating that speed, it is meaningless unless you state a frame of reference.
However, I will assume that you are referring to our galaxy's motion against the cosmic background radiation (the radiation remnant of the "Big Bang") which approximates the figure you have given. If that is the case then the speed you quote has nothing to do with the expansion of the universe, it is a local effect due to the gravitational influence of other nearby galaxies and matter.
EDIT: added "it is a local effect"