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((Short description|Type of galactic form))
((Refimprove|date=February 2017))
[[File:NGC 253 Galaxy.jpg|thumb|The [[Sculptor Galaxy]] (NGC 253) is a disk galaxy.]]

A '''disc galaxy''' (or '''disk galaxy''') is a [[galaxy]] characterized by a [[galactic disc]]. This is a flattened circular volume of [[star]]s that are mainly orbiting the galactic core in the same plane.<ref>((cite web |title=Disk Galaxies ((!)) COSMOS |url=https://astronomy.swin.edu.au/cosmos/D/Disk+Galaxies |website=astronomy.swin.edu.au))</ref> These galaxies may or may not include a central non-disc-like region (a [[galactic bulge]]).<ref>((cite web |title=The Galactic Bulge |url=http://burro.case.edu/Academics/Astr222/Galaxy/Structure/bulge.html |website=burro.case.edu))</ref> They will typically have an orbiting mass of gas and dust in the same plane as the stars. [[Interacting galaxy|Interactions]] with other nearby galaxies can perturb and stretch the galactic disk.

Disc galaxy types include:
* [[Spiral galaxy|Spiral galaxies]]:
** [[Unbarred spiral galaxy|Unbarred spiral galaxies]]: (types S, SA)
** [[Barred spiral galaxy|Barred spiral galaxies]]: (type SB)
** [[Intermediate spiral galaxy|Intermediate spiral galaxies]]: (type SAB)
* [[Lenticular galaxy|Lenticular galaxies]]: (types E8, S0, SA0, SB0, SAB0)

Galaxies that are not disc types include:
* [[Elliptical galaxy|Elliptical galaxies]]: (type dE)
* [[Irregular galaxy|Irregular galaxies]]: (type dI)

== See also ==

* [[thick disk]]
* [[thin disk]]

==References==
((Reflist))

((Galaxy))
((Portal bar|Stars|Spaceflight|Outer space|Solar System))
((DEFAULTSORT:Disc Galaxy))
[[Category:Galaxy morphological types]]

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