Superclusters--the Largest Structures in the Universe?

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Science  18 Feb 2000:
Vol. 287, Issue 5456, pp. 1217-1218
DOI: 10.1126/science.287.5456.1217

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Superclusters, conglomerates of thousands of galaxies with sizes of hundreds of millions of light-years, are the largest scale structures known in the universe. Existing surveys were too small to provide quantitative statistical measurements of their structure that can be compared directly with theoretical simulations. A new wave of galaxy surveys now promises to provide these data, which are expected to shed light on the initial matter distribution in the universe and the first steps of galaxy formation.