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Charting the Unseen Sky

Cosmologists from the U.K., France and Germany have come up with new maps of how dim matter moves via the universe. Scientists can’t actually observe dim matter, which creates up about 27 percent of the universe’s sum mass, given it doesn’t conflict to light. So these researchers had to infer its transformation by using information from the Sloan Digital Sky Survey (SDSS), an ongoing plan to create a 3-D map of the universe. Here, researchers have layered the plcae of galaxies (marked with black dots) pulled from the SDSS on top of their dim matter data. Warmer colors represent matter that’s headed the way, while cooler colors prove matter that’s drifting divided from us. (Source: “The phase-space structure of circuitously dim matter as compelled by the SDSS,” Journal of Cosmology and Astroparticle Physics, 2017)

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