Using the powerful Japanese Subaru telescope, an international team of researchers created and analyzed the deepest wide field map of the three-dimensional distribution of matter in the universe.
The Hyper Suprime-Cam (HSC) survey collaboration team, including scientists from Princeton University, Japan and Taiwan, used tiny gravitational distortions of images of about 10 million galaxies to make a precise measurement of the lumpiness of matter in the universe.
The weak lensing surveys such as HSC prefer a slightly less clumpy universe than that predicted by the Planck satellite. The pictures show the slight but noticeable difference. Astronomers are not yet sure whether or not this is a statistical fluctuation.