Stars may be found in multi-star systems that orbit about each other in a hierarchical organization. The great variety of stellar forms are determined almost entirely by the mass, composition and evolutionary state of these stars.
At this level, the resulting fundamental components are the stars, which are typically assembled in clusters from the various condensing nebulae. The constituents of a galaxy are formed out of gaseous matter that assembles through gravitational self-attraction in a hierarchical manner.
Galaxies can also have satellites in the form of dwarf galaxies and globular clusters. At the core, most galaxies have a supermassive black hole, which may result in an active galactic nucleus. Disc galaxies encompass lenticular and spiral galaxies with features, such as spiral arms and a distinct halo. Galaxies have a variety of morphologies, with irregular, elliptical and disk-like shapes, depending on their formation and evolutionary histories, including interaction with other galaxies, which may lead to a merger. Galaxies are organized into groups and clusters, often within larger superclusters, that are strung along great filaments between nearly empty voids, forming a web that spans the observable universe. At the largest scales, the fundamental component of assembly is the galaxy. The universe can be viewed as having a hierarchical structure.
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