NASA's Infrared Observatory Measures Expansion of Universe

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Source: NASA 12-343 

Excerpt:  …Astronomers using NASA's Spitzer Space Telescope have announced the most precise measurement yet of …the rate at which our universe is stretching apart. …It … brings the uncertainty down to 3 percent, a giant leap in accuracy for cosmological measurements.   … "Just over a decade ago, using the words 'precision' and 'cosmology' in the same sentence was not possible, and the size and age of the universe was not known to better than a factor of two," said Freedman. "Now we are talking about accuracies of a few percent." …

 http://www.nasa.gov/home/hqnews/2012/oct/HQ_12-343_Spitzer_Cepheid.html

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