More than eight hundred ultradark galaxies were discovered in the Coma Cluster, and astronomers identified a previously unobserved ring of galaxies that spans 5.6 billion light-years, or 36 degrees in the sky, making it the second-largest structure in the universe, after the Hercules–Corona Borealis Great Wall, which was first noticed in 2013.
More than eight hundred ultradark galaxies were discovered in the Coma Cluster, and astronomers identified a previously unobserved ring of galaxies that spans 5.6 billion light-years, or 36 degrees in the sky, making it the second-largest structure in the universe, after the Hercules–Corona Borealis Great Wall, which was first noticed in 2013.