The Great Wall is a vast collection of galaxies that appear to connect the Coma and Hercules superclusters, and stretches about 150 million parsecs or 500 million light years from end to end. Astronomers Margarite Geller and John Huchra at the Center for Astrophysics discovered it in 1988- 1989 while investigating the data they collected on some 1060 galaxies. The Great Wall stretches from Right Ascension 8 hours to 17 hours at declinations between +26 to +32, and can be seen in the motions of galaxies with velocities between 7000 to 10,000 kilometers per second. With a Hubble Constant of 75 km/sec/mpc, this corresponds roughly to a distance range from 300 to 430 million light years from the Milky Way.

Copyright (C) 1997 Dr. Sten Odenwald