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The Struggle to Measure Cosmic Expansion Free

19 August 2008
The New York Times: This spring, in what he called "a triumph of metrology," Adam Riess from Johns Hopkins University and Lucas Macri of Texas A&M University,announced they had used the Hubble Space Telescope to make the newest and most precise measurement yet of the Hubble constant-- the measure that tells astronomers how fast the universe is growing, how big it is and how old it is.

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