•group of galaxies held together by gravitational
attraction = Galaxy Cluster
•Virgo cluster @18 Mpc,
2500 galaxies, 3Mpc wide
•Coma cluster @90 Mpc,
10,000? galaxies(80% elliptical)
•Virgo and Hercules
clusters irregular (more mixed)
•
•CLUSTERS of CLUSTERS ® Superclusters
•Local Supercluster 40-50 Mpc
wide, 1015 M¤
•
•Milky Way 20 Mpc from center of Local
Supercluster