Cosmos » Astronomy Artist impression of the Big Ring (blue) and Giant Arc (red). Credit: University of Central Lancashire/Stellarium. About 9.2 billion light-years from Earth is a colossal structure which has confounded astronomers. The discovery might upend current cosmological theories. What they’ve found is a 1.3-billion-light-year-across, almost perfect ring of galaxies. No such structure has been seen before. And it doesn’t match any known formation mechanism. It has been dubbed the “Big Ri...