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Cosmologists have produced an enormous map of the distribution of dark matter in our Universe, tracing the invisible substance by monitoring its gravitational effects on light.

The picture, which maps clumps and voids of dark matter in a patch of sky covering around two million galaxies and showing features hundreds of millions of light years across, was presented by Chihway Chang of the Swiss Federal Institute of Technology in Zurich on 13 April at a meeting of the American Physical Society in Baltimore, Maryland. The researchers also describe their results in an upcoming issue of the Monthly Notices of the Royal Astronomical Society.1

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