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The Most Precise Measurement Yet of the Expanding Universe Is Achieved by Astronomers of the Sloan Digital Sky Survey

07 April 2014 — Astronomers at Penn State University and other institutions participating in the Sloan Digital Sky Survey have used 140,000 distant quasars to measure the expansion rate of the universe when it was only one-quarter of its present age. This measurement is the best yet of the expansion rate at any epoch in the last 13 billion years during the history of the universe.

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