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.
Keep close to Nature's heart. and break clear away, once in awhile, and climb a mountain or spend a week in the woods. John Muir Take a course in good water and air; and in the eternal youth of Nature you may renew your own.