Hercules–Corona Borealis Great Wall

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

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What Wikipedia says

The Hercules–Corona Borealis Great Wall (HCB) or simply the Great Wall or the Great Gamma-Ray Burst Wall is a putative galaxy filament that, if confirmed, would be one of the largest known structures in the observable universe, measuring approximately 10 billion light-years in length, or ~10.8% the length of the observable universe.

Excerpt from the Wikipedia article “Hercules–Corona Borealis Great Wall”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: István Horváth, Zsolt Bagoly, Jon Hakkila, L. V. Tóth, Public domain, via Wikimedia Commons.