Giant fractals are out - the universe is a big smoothie: They tested for clusters by placing any given galaxy in the centre of an imaginary sphere and counted the number of galaxies within it. If clustering exists, there should be more galaxies within a sphere than if the 220,000 galaxies were distributed randomly throughout the huge cube.
With relatively small spheres – up to about 330 million light years wide – they did find galactic clusters. But in larger spheres the number of galaxies met expectations for randomness.
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