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The Great Space Coaster: Expansion of the Universe Now Measured in an Era before Dark Energy Takes Over

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A graph showing how the universe's expansion rate has changed over the last 10-billion years.
(image by Zosia Rostomian, LBNL, and Nic Ross, BOSS Lyman-alpha team, LBNL)
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For the past five-billion years, the expansion of the universe has been powered by a mysterious repulsive force known as "dark energy." Now, thanks to a new technique for measuring the three-dimensional structure of the distant universe, scientists in an international team within the Sloan Digital Sky Survey (SDSS-III), including an astronomer at Penn State University, have made the first measurement of the rate of this cosmic expansion as it was just three-billion years after the Big Bang.

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At science.psu.edu

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