Measuring the distant universe in 3-D

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BOSS is extending the existing Sloan Digital Sky Survey map of the universe based on galaxies, center, into the realm of intergalactic gas in the distant universe, using the light from bright quasars (blue dots).
Zooming in on a slice of the BOSS map shows  areas with more (red) and less (blue) intergalactic gas, as revealed by correlations of the Lyman-alpha forest data from the spectra of thousands of quasars. A distance of one billion light years is indicated by the scale bar.
DOE/Lawrence Berkeley National Laboratory

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