Fig12_12 Inside coma cluster

Fig12_12 Inside coma cluster

Fig. 12.12 . More than 1,000 identified galaxies are located within the Coma cluster, also designated Abell 1656, which has a mean distance of 321 million light-years and is more than 20 million light-years in diameter. Each of these galaxies contains hundreds of billions of stars. Most of the galaxies that inhabit the central portion of this cluster are giant elliptical galaxies. Several spiral galaxies are found farther out from the center, such as the one shown in the upper left of this mosaic of images taken from the Hubble Space Telescope. Nearly every object in this picture is a galaxy. It is a section of the cluster that is several million light-years across, and is located about one-third of the way out from the center. (Courtesy of NASA/ESA/Hubble Heritage/STScI/AURA.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University