An artist's impression of the black hole (in the center), surrounding disk of hot material (depicted in white, green, and blue) and outer torus (in red) that make up the central region of the quasar SDSS J0123+01. The outer radius of the torus is about 100 light-years across. If we see the torus edge on (as in the image), the bright emission from the central hot disk is blocked and the system is categorized as a type 2 quasar.