The Local Group is the galaxy group that includes the Milky Way.It has a total diameter of roughly 3 megaparsecs (9.8 Mly), and a total mass of the order of 2 × 10 12 solar masses (4.0 × 10 42 kg). At the base of the tuning fork are the regular, roughly spherical cD clusters. Cluster Environment The central regions of the Coma cluster.The bright cD galaxy is clearly visible. The first redshifts to galaxies in the cluster were measured in the 1910s. Astrophys. More than 1,100 open clusters have been discovered within the Milky Way Galaxy, and many more are thought to exist. Regular galaxy clusters are spherically shaped, and usually rich, which means they have thousands of galaxy members. There are two types of galaxy clusters a regular cluster and an irregular cluster. seeks to organize the evolutionary state of rich cluster in a tuning-fork type diagram. There are four classifications types of galaxy clusters: regular,irregular, rich, and poor. D) several dozen galaxies. Along with the Leo Cluster (Abell 1367), it is one of the two major clusters comprising the Coma Supercluster. Globular clusters, so called because of their roughly spherical appearance, are the largest and most massive star clusters. The largest nearby cluster of galaxies is the Virgo Cluster, named after the constellation in which we see it. Mly represents millions of light-years, a measure of distance. Most galaxies are not alone in the vast expanse of space, but are connected to one or more other galaxies by gravity.The same force that holds you onto the Earth can keep many individual galaxies bound together. The Coma Cluster, shown in Figure 24.1, is another. C) about 1000 galaxies. The fraction of the mass of a rich cluster of galaxies which is in a form that we can see (i.e., that emits or reflects light or other electromagnetic radiation) is about ____ percent. The Virgo Cluster is a fairly poor, loosely concentrated, irregularly shaped (see Fig. This usage is distinct from the usual physical definition of a solid metal.

Called the Corona Borealis Cluster, this rich cluster is far outside the limit of the circle shown in Figure 24.17. Clusters are then grouped together in superclusters which contain dozens of clusters. Galaxy groups and clusters are the largest known gravitationally bound objects to have arisen thus far in the process of cosmic structure formation. More than 1,100 open clusters have been discovered within the Milky Way Galaxy, and many more are thought to exist. Most galaxies are related to others in large galaxy clusters. These clusters are called poor or rich depending on how many galaxies they contain.

The Coma cluster contains about 10,000 galaxies. the stars in all the galaxies, make up only a small fraction of the total of what makes up the cluster.’ It is only one of many other large and distant groups of galaxies scattered throughout the observable universe. The distance to the Virgo Cluster would have to wait until the 1930s. A large galaxy cluster may contain thousands of galaxies. Within rich clusters, there are many elliptical galaxies, but few spiral galaxies. It is approximately 90 Mpc away and 5 Mpc in diameter. Clusters of Galaxies. The Coma cluster (in the constellation Coma Berenices) is an example of an extremely rich cluster of galaxies. The total number of galaxies in a rich, regular cluster of galaxies such as the Coma cluster is believed to be A) about 10,000 galaxies. Credit: ESA/Hubble & NASA Though several globular clusters, such as Omega Centauri in the

Globular cluster, a large group of old stars that are closely packed in a symmetrical, somewhat spherical form. A small or poor galaxy cluster may contain only a few dozen galaxies. Coma cluster, nearest rich cluster of galaxies containing thousands of systems.