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spiral galaxy

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.01 sec.
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.


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About 210 million years ago, a small galaxy plunged into Andromeda--the spiral galaxy closest to the Milky Way.
All wear white and either hop up and down or jog in place (one can't tell which since the troupe is revealed only from waist up) to a sound track of foot-steps and droning music in front of a backdrop depicting a spiral galaxy.
A spiral galaxy appears as a delicate pinwheel from a staggering 25 million light-years away.
 
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