Hercules–Corona Borealis Great Wall

The Hercules–Corona Borealis Great Wall (HCB) or simply the Great Wall or the Great Gamma-Ray Burst Wall is a putative galaxy filament that, if confirmed, would be one of the largest known structures in the observable universe, measuring approximately 10 billion light-years in length, or ~10.8% the length of the observable universe. This massive superstructure is a region of the sky seen in the data set mapping of gamma-ray bursts (GRBs) that has been found to have a concentration of similarly distanced GRBs that is unusually higher than the expected average distribution.

Source: Wikipedia — Hercules–Corona Borealis Great Wall (CC BY-SA 4.0)