Large-scale structureSky surveysand mappings of the various wavelengthbands of electromagnetic radiation(in particular 21-cm emission) have yielded much information on the content and character of the universe's structure. The organization of structure appears to follow as a hierarchicalmodel with organization up to the scaleof superclustersand filaments. Larger than this, there seems to be no continued structure, a phenomenon which has been referred to as the End of Greatness. Walls, filaments and voidsDTFE reconstructionof the inner parts of the 2dF Galaxy Redshift SurveyThe organization of structure arguably begins at the stellar level, though most cosmologists rarely address astrophysicson that scale. Starsare organized into galaxies, which in turn form clustersand superclustersthat are separated by immense voids, creating a vast foam-like structure sometimes called the "cosmic web". Prior to 1989, it was commonly assumed that virialized
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Redshift, Large-scale structure of the cosmos, Sloan Great Wall, Galaxy Redshift Survey