This new map of invisible dark matter in the universe shows the stuff concentrated in clumps (white) and sparse in voids (dark). Each of the four images represents observations for a single season; the winter frame (upper left) is largest, at 1 billion light-years across, because it has the most dark hours. The inset near the center of the image shows the full moon, for scale, and the scale of the previous largest deep-imaging dark matter survey, gathered by the Hubble Space Telescope.
Credit: L. Van Waerbeke, C. Heymans, CFHTLens Collaboration
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