Gamma-Ray Bursts Reveal Hercules-Corona Borealis Great Wall Is Larger And Closer Than Ever Known
Astronomers have discovered that the Hercules-Corona Borealis Great Wall — the largest known structure in the universe — is even bigger and closer than previously thought.
Astronomers have made a startling discovery about the largest known structure in the universe: the Hercules-Corona Borealis Great Wall is even larger than previously believed. Using data from Gamma-Ray Bursts (GRBs) — the most powerful explosions in the universe — researchers have uncovered evidence that expands the already mind-boggling scale of this cosmic colossus.
Originally discovered in 2014, the Hercules-Corona Borealis Great Wall is a massive supercluster of galaxies, a filamentary structure of the cosmic web — the large-scale structure of the universe where galaxies form and cluster. This enormous structure was first identified by a team led by István Horváth, Jon Hakkila, and Zsolt Bagoly. Now, the same team has returned with refined measurements that not only confirm its staggering scale but reveal that it reaches closer to Earth than scientists once believed.
"Since the most distant extent of the Hercules-Corona Borealis Great Wall is hard to verify, the most interesting finding is that the closest parts of it lie closer to us than had previously been identified," said Jon Hakkila of the University of Alabama in Huntsville in an interview with Space.com.
Spanning an incredible 10 billion light-years in width, 7.2 billion light-years in height, and almost 1 billion light-years thick, the Great Wall is big enough to fit over 94,000 Milky Way galaxies side by side. For comparison, the Laniakea Supercluster, which includes the Milky Way, measures just 500 million light-years across — making it look minuscule next to this vast cosmic wall.
The name “Hercules-Corona Borealis Great Wall” was coined by Johndric Valdez, a Filipino teenager with aspirations of becoming an astronomer. Though the name suggests a location tied to the Hercules and Corona Borealis constellations, the structure also stretches across a much larger portion of the sky, from Boötes to Gemini.
The latest findings stem from analysis of GRBs, which are thought to originate from the collapse of massive stars and serve as useful tools for tracing the distribution of matter across the cosmos. With their immense brightness, GRBs can be seen from billions of light-years away, offering astronomers a way to map large-scale cosmic structures with remarkable precision.
While the structure’s known span is already immense, researchers suggest it may actually extend even farther than the 10 billion light-years previously identified.
"Our gamma-ray burst sample is not large enough to place better upper limits on the maximum size of the Hercules-Corona Borealis Great Wall than we already have," Hakkila said. "But it probably extends farther than the 10 billion light-years we had previously identified. It is larger than the size of most anything to which it might be compared."
The discovery poses a significant challenge to current cosmological models, which predict a relatively uniform distribution of matter on the largest scales. The sheer size of the Hercules-Corona Borealis Great Wall raises questions about the limits of cosmic structure formation and may lead scientists to re-evaluate the way the universe evolved.
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