Together with irregular galaxies, spiral galaxies make up approximately 60 percent of the galaxies in the local universe. However, despite their prevalence, each spiral galaxy is unique — like snowflakes, no two are alike. This is demonstrated by the striking face-on spiral galaxy NGC 6814. via NASA http://www.nasa.gov/image-feature/goddard/2016/hubble-spies-a-spiral-snowflake
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