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Encyclopedia > Unbarred spiral galaxy

An unbarred spiral galaxy is a galaxy with out a central bar, or one that is not a barred spiral galaxy. It is designated with an SA in the galaxy morphological classification scheme. NGC 1300, viewed nearly face-on. ... Astronomers classify galaxies based on their overall shape (elliptical, spiral or barred spiral) and further by the specific properties of the individual galaxy (for example degree of ellipse, number of spirals or definition of bar). ...


 
 

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