WHAT IS THE BIGGEST OBJECT IN THE UNIVERSE?

The biggest single entity that scientists have identified in the universe is a supercluster of galaxies called the Hercules-Corona Borealis Great Wall. It's so wide that light takes about 10 billion years to move across the entire structure. For perspective, the universe is only 13.8 billion years old. Astronomers were able to determine the size by mapping gamma-ray bursts from this group of galaxies. The supercluster is so humungus that it defies the laws of inflation. The Milky Way galaxy is 100,000 light-years wide. However, the Milky Way's width is merely 0.001 percent of the width of the Great Wall. For another perspective the Great Wall is 10 percent of the diameter of the observable universe. Now that is truly unfathomable.