Clusters of Galaxies
We are now about 200 000 000 light years from Earth, seeing huge clusters and superclusters of galaxies. No matter where telescopes are pointed there are vast numbers of galaxies such as seen in this image. The largest of the elliptical galaxies are perhaps ten times the size of the Milky Way, or about 1 000 000 light years in diameter. The largest galaxies gravitationally affect enormous volumes of space, creating clusters of galaxies. The clusters in turn are grouped into vast superclusters.
Copyright © 2016 by Bruce Bryson