Figure 13-55

Quasar 3C 273 This combined X-ray and infrared view shows the starlike object associated with the radio source 3C 273 and the luminous jet it has created. The jet is also visible in the radio and visible parts of the spectrum. By 1963, astronomers determined that the redshift of this quasar is so great that, according to the Hubble law, it is nearly 2 Bly from Earth.