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A '''spiral galaxy''' is a [[galaxy]] consisting of a rotating disk of [[star]]s, [[gas]] and [[dust]] which has two arms that extend outwards from the central bulge.
A '''spiral galaxy''' is a [[galaxy]] consisting of a rotating disk of [[star]]s, [[gas]] and [[dust]] which has two arms that extend outwards from the central bulge.
A '''spiral galaxy''' is suggestive of a young universe, and a theory of [[dark matter]] has been proposed to try to reconcile its spiral pattern with belief in an old universe.
A '''spiral galaxy''' is evidence of a young universe, and a theory of [[dark matter]] has been proposed to try to reconcile its spiral pattern with belief in an old universe.
The [[milky way]] is a spiral galaxy.
The [[Milky Way]] is a spiral galaxy.
[[Category:Astronomy]]
[[Category:Astronomy]]