Thursday, October 7, 2021

Have you heard of the Chinese wall? Most likely, yes, but now we will talk about The Great Wall of Hercules

The Hercules-Corona Borealis Great Wall or the Great Wall is the largest known structure in the observable universe, measuring approximately 10 billion light-years in length (for perspective, the observable universe is approximately 93 billion light-years in diameter ).

It is located in the constellations of Hercules and the Corona Borealis. It was discovered in 2013 with the Swift satellite and the Femi gramma ray telescope. 

It is said that the great wall of Hercules-Corona Borealis was formed 4 billion ago after the famous Big Bang theory that wall is so large that it occupies almost 11% of the observable universe. It is so called because there is the constellation Hercules and the constellation of the Corona Borealis. If we ask ourselves what is the biggest thing in the universe, we have found it is the Great Wall of Hercules astonishing scientists, because the Universe must be homogeneous on a large scale and not contain a "disorder" of this type, that is, a such a massive concentration of galaxies in a given place. The Great Wall of Hercules Corona Borealis breaks this cosmological rule, so it is necessary to rethink the homogeneity of the distribution of matter in the Universe.

This massive superstructure is a region of the sky seen in the Gamma-ray Burst Dataset (GRB) mapping that has been found to have an unusually higher concentration of GRB with similar distances than the expected average distribution.

It was discovered in early November 2013 by a team of American and Hungarian astronomers led by István Horváth, Jon Hakkila, and Zsolt Bagoly while analyzing data from the Swift Gamma-Ray Burst mission, along with other data from ground-based telescopes.

It is the largest known formation in the universe, exceeding the size of the previous Huge-LQG by approximately twice.

The overdensity is in the second, third and fourth galactic quadrants (NQ2, NQ3 and NQ4) of the sky. Therefore, it is located in the northern hemisphere, centered on the border of the constellations Draco and Hercules. The complete grouping consists of about 19 GRBs with the redshift ranges between 1.6 and 2.1.

Photo: NASA / ESA

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