Editing Astronomical object (section)

== Galaxy and larger ==
The [[universe]] can be viewed as having a hierarchical structure.<ref>{{cite book | first=Jayant V. | last=Narlikar | date=1996 | title=Elements of Cosmology | publisher=Universities Press | isbn=81-7371-043-0 | url=https://books.google.com/books?id=uZgbMUypq_oC&pg=PA4 }}</ref> At the largest scales, the fundamental component of assembly is the [[galaxy]]. Galaxies are organized into [[Galaxy groups and clusters|groups and clusters]], often within larger [[supercluster|superclusters]], that are strung along great [[galaxy filament|filaments]] between nearly empty [[Void (astronomy)|voids]], forming a web that spans the observable universe.<ref name=smolin1998>{{cite book | first=Lee | last=Smolin | date=1998 | page=[https://archive.org/details/lifecosmos00smol/page/n43 35] | title=The life of the cosmos | url=https://archive.org/details/lifecosmos00smol | url-access=limited | publisher=[[Oxford University Press US]] | isbn=0-19-512664-5 }}</ref>

Galaxies have a variety of [[Galaxy morphological classification|morphologies]], with [[irregular galaxy|irregular]], [[elliptical galaxy|elliptical]] and [[disc galaxy|disk-like]] shapes, depending on their formation and evolutionary histories, including [[interacting galaxy|interaction]] with other galaxies, which may lead to a [[galaxy merger|merger]].<ref>{{cite book |author1=Buta, Ronald James |author2=Corwin, Harold G. |author3=Odewahn, Stephen C. | page=301 | date=2007 | title=The de Vaucouleurs atlas of galaxies | publisher=[[Cambridge University Press]] | isbn=978-0-521-82048-6 }}</ref> Disc galaxies encompass [[lenticular galaxy|lenticular]] and [[spiral galaxy|spiral galaxies]] with features, such as [[Spiral galaxy#Spiral arms|spiral arms]] and a distinct [[Galactic halo|halo]]. At the core, most galaxies have a [[supermassive black hole]], which may result in an [[active galactic nucleus]]. Galaxies can also have satellites in the form of [[dwarf galaxy|dwarf galaxies]] and [[globular cluster]]s.<ref>{{Cite book |url=https://books.google.com/books?isbn=0521318874 |title=Astronomical Objects for Southern Telescopes |isbn=0521318874 |access-date=13 February 2017|last1=Hartung |first1=Ernst Johannes |date=1984-10-18 |publisher=CUP Archive }}</ref>