This picture, taken by the Subaru Telescope on the summit of Mauna Kea in Hawaii, shows four images of the same quasar (the four white dots in the center). The quasar is almost 10 billion light-years from us and its light has been split into four by the gravitational influence of a foreground cluster of galaxies 6.2 billion light-years from us. Some of the galaxies of the cluster appear as yellow dots in the image.