Remote Reconnaissance of Another Solar System. Quasar Cluster: Largest Object In The Universe May Disprove Einstein's Cosmological Principle. Astronomers have discovered the largest object in the universe.
In fact it's so big, it might challenge a key principle of cosmology predicted by none other than Einstein himself. The object is a group of quasars from that four billion light years across. Together they form the largest structure in the universe, researchers at the University of Central Lancashire reported in the journal of the Royal Astronomical Society. The size of the sun in comparison. Carl Sagan, Stephen Hawking and Arthur C. Clarke - God, The Universe and Everything Else (1988)
Michio Kaku: The Universe in a Nutshell. Is The Universe Alive?