Scientists have discovered a massive ring-shaped structure in space that challenges our understanding of the universe.
The cosmic megastructure, dubbed the Big Ring, has a diameter of about 1.3 billion light-years and is among the largest structures ever observed. It appears to be roughly the size of 15 moons in the night sky as seen from Earth.
The Big Ring is so large that it challenges the cosmological principle. This fundamental cosmological assumption says that the universe is homogeneous on a large scale and looks the same in all directions.
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