Galaxies collide, why if everywhere space is expanding
The farthest galaxies seem further apart because as an observer looks into the distance  the greater and greater the volume of space the galaxies are in. Not because of expansion of space.
What are the ways that distance and speeds are measured?  If the redshift is used to measure recession from the observer then it is misguided in this context. If there is no change in the light within galaxies or in astronomical terms, close by galaxies. But the further and further distant galaxies show greater and greater redshift. It indicates the clear signature of gravity of the origin of light. Gravity having twice the effect with twice the distance travelled against  the pull of gravity.
New Gravity shows that gravity is a pull on space itself, not on another mass.