6.3. The expansion of the universe Between the galaxy clusters, there are huge "empty" cavities, the so-called voids, with an average diameter of 100 million light years. The universe has a honeycomb structure on large scales, a kind of bubble structure, which we will call a "space bubble" in this study. At the overlapping regions of the space bubbles, concentrations of visible (atoms) and invisible (dark) matter occurs, which, over long periods ultimately produce our known galaxy. Despite a uniform distribution of quantized particles in the space bubbles, galaxy clusters are formed at their edges, which are pushed together by the giant space bubbles. This is also observable in the expansion of the universe. It is known that the galaxies do not attract each other gravitationally over very long distance, but by the expansion of space between them, are pushed to each other. Figure: Clusters of galaxies between the space bubbles Galaxycluster Space bubble
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