is more cake between it and the center raisin to expand. Therefore, all galaxies move away from each other because one is increasing. Fritz Zwicky mapped the sky and discovered galaxies are formed in clusters. Members of a cluster move under the influence of their own gravitational pull together. The Local Group cluster consists of thirty galaxies and it is the most prominent galaxy. Containing the Milky Way and Andromeda, this is our own cluster, which is 8.5 million light years long, holds thousands of galaxies and is very dense. They all move togethr with their mutual gravities. The Virgo cluster is 52 million light years away from the Local Group. The Local Super cluster contains 100 member cluster, including the Local Group and the Virgo cluster. It is 100 million light years across and 10 million light years thick. There are three types of evolutions of galaxies, which are spiral, irregular, and elliptical. Spiral galaxies are categorized depending on how tightly bound the arms are. Irregular shaped galaxies are thought to have occurred from galactic collision. Elliptical galaxies are circular in shape to very elongated. Nebula are composed of various kinds of gas and dust, and we can tell what they are composed of by their color. A Supernova, which is an explosion of stars, leaves Nebula. Our complex molecules originated from within stars. Galaxies are not classified by shape, but rather by radio emmisions. Two of the most powerful galaxies found by telescope after World War II were M87 or Virgo A (radio name) and NGC-5128 or Centaurus A ( radio name). After time, galaxies stop emitting and their lobes spread out. Our galaxy has an active center, but we can not see it because of the spiral arms. These galaxies are in a category named BL Lac objects. Stuff shoots out of these galaxies because of the bulging galactic center. Violent radio jets are emitted that originate from a tiny central object. Galaxies ...
