Radrook
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What effect does gravity and gravitational pull have on the expansion or motion of stars/galaxies, what effect does gravity and gravitational pull of everything have on the expansion and motion of the universe...?
Where gravity predominates then expansion is cancelled out. Such areas where it predominates are called super galactic clusters and these are organized into filaments or walls which are the largest structures known. It is in the areas separating such filaments, called voids because of the scarcity of matter, that universal expansion is occurring. Imagine the universe as a honeycomb with the galarct6ic super cluster filaments being the edges of each cell and the inside of the cells being the voids that are expanding driving the edges apart.
Matter in space ranges in size from subatomic particles to galaxy superclusters. In fact, there are larger objects than those—complexes of superclusters called walls or sheets. These structures, as much as one billion light-years across, resemble fine gauze. They are the filaments of space.
http://www.brighthub.com/science/space/articles/122209.aspx
Supercluster - Wikipedia
In physical cosmology, galaxy filaments (subtypes: supercluster complexes, galaxy walls, and galaxy sheets) are the largest known structures in the universe. They are massive, thread-like formations, with a typical length of 50 to 80 megaparsecs h−1 (163 to 261 million light-years) that form the boundaries between large voids in the universe.[3] Filaments consist of gravitationally bound galaxies. Parts wherein many galaxies are very close to one another (in cosmic terms) are called superclusters.
Galaxy filament - Wikipedia
Below is an example of filaments and voids.

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