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Measurement of Universe's Expansion Rate Creates Cosmological Puzzle


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Galaxy M101

Data from galaxies such as M101, seen here, allow scientists to gauge the speed at which the universe is expanding.

Credit: X-ray: NASA/CXC/SAO; Optical: Detlef Hartmann; Infrared: NASA/JPL-Caltech

The most precise measurement ever made of the current rate of expansion of the Universe has produced a value that appears incompatible with measurements of radiation left over from the Big Bang. 

From Nature
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