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The Leo Cluster (Abell 1367) is a galaxy cluster about 330 million light-years distant (z = 0.022) in the constellation Leo, with at least 70 major galaxies. Along with the Coma Cluster, it is one of the two major clusters comprising the Coma Supercluster. Along with being a part of the Coma Supercluster, that with many others, helps form the CfA2 Great Wall, which is hundreds of millions light years long and is one of the largest structures in the universe. Leo has many galaxies, galaxy clusters and quasars; but lacks nebulae, planetaries, or star clusters.

The core of the cluster was photographed by the Schulman telescope in Arizona. The galaxy known as NGC 3842 is at the center of this cluster. The cluster likely grew to this size due to consuming other galaxies. One galaxy, UGC 6697, is relatively new. Most galaxies in the Leo Cluster are yellow due to gas between them, and this gas has resulted in a lack of stars.

However, new galaxies are being made in this cluster. This has been occurring when other nearby galaxies are stripped of their materials by older galaxies already in this cluster. Over time, this could result in the creation of dwarf galaxy clusters due to being dynamically bound. Stars could even be dispersed, resulting in Abell 1367 becoming much brighter than it currently is.

There are a number of notable stars within the Leo Cluster. Alpha Leonis, for example, is the 21st brightest star in the night sky. While Alpha Leonis is blue, its companion star, is yellow. These stars are about 77 light years away from us and are part of one of the countless dwarf galaxies. Alpha Leonis is a triple star system, meaning that it has two other stars bound to it by gravity. This system creates the sickle of the Leo constellation.

M105 is a galaxy located in the same part of the Leo Cluster as Alpha Leonis. This galaxy proved to be incredibly important to the astronomical community. In 1997, the Hubble telescope used it to determine that black holes are present in most normal sized galaxies.

A dwarf galaxy located near Alpha Leonis is Leo I, a spherical dwarf galaxy. It is close to a star known as Regulus, which is a part of Alpha Leonis. Regulus is very bright, and that can make Leo I very hard to observe. Leo I is part of our group of galaxies and is roughly 820,000 light years away, making it our furthest satellite galaxy.