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spiral galaxy |
Also found in: Wikipedia, Hutchinson | 0.03 sec. |
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spiral galaxy [′spī·rəl ′gal·ik·sē] (astronomy) A type of galaxy classified on the basis of appearance of its photographic image; this type includes two main groups: normal spirals with circular symmetry of the nucleus and of the spiral arms, and barred spirals in which the dominant form is a luminous bar crossing the nucleus with spiral arms starting at the ends of the bar or tangent to a luminous rim on which the bar terminates. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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During the oral relay, team members each answered five questions on astronomy topics such as black holes, spiral nebulae and red giants. |
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