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Measurement of Universe's Expansion Rate Creates Cosmological Puzzle

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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