The Largest Structure in Universe Discovered: One Ring to Rule Them All

SECOND NEXUS DIGEST: Royal Astronomical Society, Mother Nature Network, Discovery

According to the Royal Astronomical Society, a team of American and Hungarian astronomers have found what appears to be a ring of nine galaxies that is five billion light years across. This pattern of galaxies would be a nearly impossible chance phenomenon, the odds being 1 in 20,000, according to the leader of the team, Dr. Lajos Balazs of Konkoly Observatory in Budapest. This suggests that the galaxies are bound together into this arrangement, most likely by gravity, in the same way that our sun is bound to the other stars of our galaxy, or by some as yet undiscovered force.

The sheer size of the configuration, one-ninth of the entire observable universe, makes this new discovery not only a candidate for the largest “structure” so far observed, but also a phenomenon that cannot be explained by our current theories of physics and how the universe was formed.

Second Nexus
An image of the distribution of GRBs on the sky at a distance of 7 billion light years, centred on the newly discovered ring. The positions of the GRBs are marked by blue dots and the Milky Way is indicated for reference, running from left to right across the image. Credit: L. Balazs.

So far, the “galactic structure” still just a hypothesis. The team located it indirectly by measuring Gamma Ray Bursts (GRBs) recorded from both space and ground-based observatories. GRBs are intense bursts of radiation associated with enormous collapsing stars; they generally originate close to galactic centers and are often used to pinpoint the locations of distant galaxies. These nine bursts are quite interesting to astronomers because they all seem approximately the same distance away from us–seven billion light-years–and form a ring. So either there are nine galaxies in a ring, or the bursts signify something else entirely.

Assuming it is a nine-galaxy ring, this discovery calls into question our current understanding of physics and how the universe was formed, which suggests that there should be a limit to how large structures in the universe can be. To put it another way, there is a limit to how far apart things can be in the universe and still have some kind of influence on each other. When galactic bodies are close together, they form a vast array of structures (planetary systems, galaxies, and so on) because different objects are bound together by gravity. But objects that are too far apart simply ought not be able to exert any substantial influence.

This leads to one of the assumptions of modern-day astrophysics: the Cosmological Principle. When you look at the universe at a large enough scale, the matter should look uniformly random. There shouldn’t be any “pattern,” because everything is too far apart to produce any meaningful structure.

If these nine galaxies really are bound together in a five billion light-year wide dance, then we have to think a lot harder to figure out how that might be possible.

A Universe of Possibilities

Although science doesn’t have an explanation, yet, for what this ring of gamma ray bursts might mean, we can always turn to alternative possibilities–even science fiction–for imaginative answers.

In 1945, Fredric Brown, one of the most prolific short story writers from the “Golden Era of Science Fiction,” published Pi in the Sky: a story in which astronomers were perplexed by seemingly impossible movements and structures appearing in the night sky. It turned out to be a technologically-induced optical trick (“some kind of four-dimensional refraction”) that was created for marketing purposes.

While it is unlikely that an image of a five billion light year wide ring of galaxies is being projected in order to sell us something, it is certainly possible that that the pattern is

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