Suppose that you take a few billion simulated dark matter particles (each one representing zillions of real dark matter particles) and start them off in the early universe, letting them interact under their mutual gravitation. A few billion years later, they make funky patterns like this from the Millenium Simulation:
The lights along the filaments are galaxy clusters. Major intersections are superclusters. The distance scale indicator is 125 Mega parsecs or about 400 million light years - about 5000 times the diameter of our galaxy, the Milky Way.
The guys at Max Planck Institut also did a fly through video, including a look around at a supercluster:
An imagined reality with empirical support.
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