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The three-dimensional distribution of luminous matter has a "soap-bubble"
appearance, with the visible galaxies mostly on the surface of these soap
bubbles.
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Superclusters of galaxies appear as elongated strands where different soap bubbles
come together.
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Clusters of galaxies appear as bright spots on the strands corresponding to the
superclusters.
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The soap bubbles surround large voids of approximately 100 Mpc size
that contain little easily seen matter.
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The Universe is consistent with a soap-bubble structure, but not a
"spaghetti structure".
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Such observations place strong constraints on our later discussions of the
origin of structure in the Universe, since any viable theory of such
structure must explain why the Universe has the appearance described above.