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[[File:Spiral galaxy.jpg|right]]
[[File:Spiral galaxy.jpg|right]]
A '''spiral galaxy''' is a [[galaxy]] consisting of a rotating disk of [[star]]s, [[gas]] and [[dust]] which has a number of arms extending outwards from the galactic centre. Some spiral galaxies have a prominent bulge around the centre, while others have a bar crossing the centre with the spiral arms extending from the ends of the bar.
A '''spiral galaxy''' is a [[galaxy]] consisting of a rotating disk of [[star]]s, [[gas]] and [[dust]] which has a number of arms extending outwards from the galactic centre.<ref>[https://www.britannica.com/topic/galaxy/Types-of-galaxies#ref559197 Galaxies] from britannica.com</ref> Some spiral galaxies have a prominent bulge around the centre, while others have a bar crossing the centre with the spiral arms extending from the ends of the bar. They tend to be fairly large and blue in color.
Some Creation scientists have argued that spiral galaxies are [[Arguments for a recent creation|evidence of a young universe]].
Some Creation scientists have argued that spiral galaxies are [[Arguments for a recent creation|evidence of a young universe]].<ref>[https://answersingenesis.org/astronomy/cosmology/galaxies-unexplained-spirals/ Galaxies-unexplained spirals] from answersingenesis.org</ref>
The [[Milky Way]] is a spiral galaxy, as is the [[Andromeda galaxy]], the closest large galaxy to the Milky Way.
The [[Milky Way]] is a spiral galaxy, as is the [[Andromeda galaxy]], the closest large galaxy to the Milky Way.
==Classification==
Spirals are classified by whether they contain a bar and how tightly wound its arms are. If a spiral galaxy contains a bar, it is labelled "SB" and simply "S" if it has no bar.<ref name=spacetelescope>[https://www.spacetelescope.org/images/heic9902o/ Galaxy classification] from spacetelescope.org</ref> The tightness of the arms is characterised by the letters a, b and c, with a meaning a galaxy with the tightest winding, c with the loosest winding and b somewhere in between. The size of the bulge decreases with this classification, with a having the largest bulge and c having the smallest.<ref name=spacetelescope/> For example, a barred spiral galaxy with a large bulge and tightly wound arms would be labelled "SBa".
==References==
{{reflist}}
{{Galaxies}}
{{Galaxies}}
[[Category:Astronomy]]
[[Category:Astronomy]]