Astronomers Observe Largest Structure in Universe

Large quasar group stretches 4 billion light years

Astronomers have spotted the largest structure ever seen in space. The object so massive that, in the words of one scientist, it will change astronomy's "current understanding of the scale of the universe."

The structure is a large quasar group, a collection of gigantic galactic cores held together by a supermassive black hole. The group, or LQG, stretches 4 billion light-years across.