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There are spiral galaxies with numerous, ragged spiral arms in their disks (called ``flocculent'' spirals), so perhaps the self-propagating star formation mechanism is responsible for the flocculent spirals. A ``grand-design''spiral seen face-on. A flocculent spiral with ragged spiral arms.
In this model, there are 4 spiral arms and the Sun is located about 7.9 kpc from the center of the galaxy (marked by a +). While this appears to show where the arms are, other maps by other astronomers show different features or a different number of arms. Based upon data from J. P. Vallee (2005).n this model, there are 4 spiral arms and the Sun is located about 7.9 kpc from the center of the galaxy (marked by a +). While this appears to show where the arms are, other maps by other astronomers show different features or a different number of arms. Based upon data from J. P. Vallee (2005).