This image is the largest map of dark matter in large scale structure ever made. White contours delimit dark matter mass density levels; orange regions are dense, dark-red regions correspond to cosmic voids. White circles indicate the average density of normal matter, traced by star light in galaxies, which tends to coincide with the dark matter densest regions. The area of the sky is 8x8=64 square degrees, which is a large field of view of several dozens of Megaparsecs across. More details available here.
© 2013 Van Waerbeke and CFHTLenS