Saturday, November 10, 2012
The Great Wall (CfA2) is a layer of galaxies situated 250 million light years away, beyond the border of the Milky Way. It has a length of 500 million light years, and a width of 300 million light years. Its thickness or depth has not been determined yet, due to the dust and gas of the Milky Way that blocks the view. The Great Wall of Galaxies was discovered in 1989 by John Huchra and Margaret Geller.