Difference between revisions of "Spiral galaxy"
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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 | + | 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 [[ | + | The [[Milky Way]] is a spiral galaxy. |
[[Category:Astronomy]] | [[Category:Astronomy]] | ||
Revision as of 04:38, December 12, 2009
A spiral galaxy is a galaxy consisting of a rotating disk of stars, gas and dust which has two arms that extend outwards from the central bulge.
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.