Group Of Galaxies Called "Stephan's Quintet" (Favored Object For Amateur Astronomers With Good Hobby Telescopes). The Quintet Is A Prototype Of A Class Of Objects Known As 'Compact Groups Of Galaxies' - NASA/ESA Hubble Space Telescope
This diagram shows our cosmic address at a glance. We see our planetary system around the Sun, our stellar neighborhood in our galaxy, our galaxy in the local group of galaxies, and our group in the entire universe.
The largest known structure in the universe, a clump of active galactic cores that stretch 4 billion light-years from end to end. The structure is a light quasar group (LQG), a collection of extremely luminous Galactic Nulcei powered by supermassive central black holes. Just boggles the mind, dont it?