The image above illustrates the concept of measuring the universe from the Baryon Oscillation Spectroscopic Survey. 

A team of researchers has measured the current size of "baryon acoustic oscillations" (BAOs) from the early universe in order to determine the distances to galaxies more than 6 billion light-years away to within 1 percent accuracy.

Their findings support the idea that dark energy has remained constant throughout the life of the universe. 

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Credit: Zosia Rostomian, Lawrence Berkeley National Laboratory