Great Wall Facts for Kids

The Great Walls are the largest known structures in the universe. They are based on data set mapping of gamma-ray bursts (GRBs). The mapping found an unusually high concentration of similarly distanced GRBs in certain areas.

Structures larger than 1,200,000,000 light years are incompatible with the cosmological principle according to all estimates.

**List of the largest cosmic structures**
Structure name (year discovered)	Maximum dimension (in light years)	Notes
Hercules-Corona Borealis Great Wall (2014)	10,000,000,000	Discovered through gamma-ray burst mapping, and is the first structure to exceed 10 billion light years.
Giant GRB Ring (2015)	5,600,000,000	Discovered through gamma-ray burst mapping. Largest known regular formation in the observable Universe.
Huge-LQG (2012-2013)	4,000,000,000	Decoupling of 73 quasars. Largest known large quasar group and the first structure found to exceed 3 billion light years.
U1.11 LQG (2011)	2,500,000,000	Involves 38 quasars. Adjacent to the Clowes-Campusano LQG.
Clowes-Campusano LQG (1991)	2,000,000,000	Grouping of 34 quasars. Discovered by Roger Clowes and Luis Campusano.
Sloan Great Wall (2003)	1,370,000,000	Discovered through the 2dF Galaxy Redshift Survey and the Sloan Digital Sky Survey.
Pisces-Cetus Supercluster Complex (1987)	1,000,000,000	Contains the Milky Way, and is the first galaxy filament to be discovered. (The first LQG was found earlier in 1982.) A new report in 2014 confirms the Milky Way as a member of Laniakea Supercluster.
CfA2 Great Wall (1989)	750,000,000	Also known as the Coma Wall
Laniakea Supercluster (2014)	520,000,000	Galaxy supercluster in which the Earth is located
Horologium Supercluster (2005)	550,000,000	Also known as Horologium-Reticulum Supercluster.

Images for kids

Huayi tu, a 1136 map of China with the Great Wall depicted on the northern edge of the country
The Great Wall of the Qin stretches from Lintao to Liaodong
The Great Wall of the Han is the longest of all walls, from Mamitu near Yumenguan to Liaodong
The extent of the Ming Empire and its walls
Part of the Great Wall of China (April 1853, X, p. 41)
The Great Wall in 1907
A more rural portion of the Great Wall that stretches through the mountains, here seen in slight disrepair
Identical satellite images of a section of the Great Wall in northern Shanxi, running diagonally from lower left to upper right and not to be confused with the more prominent river running from upper left to lower right. In the image on the right, the Great Wall has been outlined in red. The region pictured is 12 km × 12 km (7 mi × 7 mi).
Great Wall of Han dynasty near Yumenguan.
Ming dynasty Great Wall at Jinshanling
Remains of Beacon tower near Yumenguan, 2011
"The First Mound" – at Jiayu Pass, the western terminus of the Ming wall
The Great Wall near Jiayu Pass
Ming Great Wall remnant near Yinchuan
The Great Wall remnant at Yulin
The Great Wall at Badaling
The Juyongguan area of the Great Wall accepts numerous tourists each day
Gateway of Gubeikou Fortress
Environmental protection sign near Great Wall, 2011
Ming Great Wall at Simatai, overlooking the gorge
Mutianyu Great Wall. This is atop the wall on a section that has not been restored
The Old Dragon Head, the Great Wall where it meets the sea in the vicinity of Shanhai Pass
The Great Wall at dawn
Inside the watchtower
Badaling Great Wall during winter

Great Wall facts for kids

Images for kids

See also