Keywords: Dark matter halo.png en Projected density plot of a redshift <math>z 2 5</math> dark matter halo from a cosmological N-body simulation The visible part of the galaxy not shown in the image lies at the dense centre of the halo and has a diameter of roughly 20 kiloparsecs There are also many satellite galaxies each with its own subhalo which is visible as a region of high dark matter density in the image English Wikipedia http //en wikipedia org/wiki/Image Dark_matter_halo png http //en wikipedia org/wiki/User Cosmo0 Public domain Cosmo0 Dark matter Cosmology Galaxies |