Quick question on cosmology. As everyone knows, the expansion of spacetime increases the distance between galaxies. However, I'm wondering if the same expansion increases the distance between stars in any specific galaxy. I vaguely remember my cosmology professor saying that this does not happen since the stars in any individual galaxy are "graviationally bound" (but as I said I remember vaguely, so tell me if this is wrong). So my question is: does the gravitational attraction between stars in our galaxy negate the effect of expansion completely, or merely diminish it so that it is not as easily detectable?