This Tiny Dot is one of the Biggest, Most Active Galaxy Superclusters Ever Seen. It Was Already a Monster Shortly After the Big Bang

A newly discovered supercluster of galaxies is so distant that astronomers say its light has been traveling for over twelve billion years to reach telescopes on Earth. But this cluster, named SPT2349 ?56 is gigantic, and so old that it is actually classified as a proto-cluster of galaxies, meaning it might be one of the …