A galaxy is a large collection of solar systems, black holes, interstellar dust, stray planets, and other objects that resides in a Galaxy cluster. They vary greatly in size and density, from Segue 2 measuring just 220 light-years across and containing 1000 stars, to IC 1101 measuring over 4 billion light-years wide and containing 100 trillion stars. Because of this, galaxies are often categorized into smaller dwarf galaxies, and larger major galaxies. These are further subclassed into, spiral, ring, and elliptical galaxies, with the catch-all being irregular galaxies. Our local galaxy is known as the Milky Way and is a major spiral galaxy.
Many galaxies will often have satellite (and usually dwarf) galaxies orbiting them. Some of these satellite galaxies have fully stable orbits, others may get absorbed and degrade into clusters, and some might even get disintegrated from their host entirely. For example, the Milky Way has two famous satellite galaxies known as the Large Magellanic Cloud (LMC) and Small Magellanic Cloud where several stars have been discovered.
Galaxy is part of a series on verses.
|Universe • Hypercluster/Void • Supercluster • Galaxy cluster • Galaxy/Dwarf galaxy • Cluster • Star • Planet • Moon • Asteroid • Continent • Country • State • City • Entity • Compound • Atom • Subatomic particle • Quark • Preon • String|