Hubble Space Telescope/W. M. Keck Observatory
This galaxy (CDF-S:[MBR2003]H_0941) contains two nuclei, indicating a recent galaxy-galaxy collision. The right-hand nucleus is slightly bluer than its partner. The galaxy is an X-ray source and is 4.6 billion light years away. This three color image combines optical light from the Hubble space telescope with infrared light from the Keck laser guide star system.