The Largest Known Structure in the Universe

The scale of the universe is mind-boggling. Within that boggle is a strange fact: the largest “structure” we have observed in the universe is so large that it should not exist according to current science. The largest structure (so far as of March 29, 2019) is the “Her-Cr Great Wall”. Why should this sheet-like group of galaxies not exist, though? Well, the universe’s maximum light travel distance is supposed to be only 13 billion years. With the speed of light is a constant and given the known expansion rate of the universe, the Her-Cr Great Wall structure should not have … Continue reading The Largest Known Structure in the Universe