Using the theories of stars, we got that dense, dusty gas clouds are more likely to find within (or on the edges of) spiral arms of a spiral galaxy than in between these arms.
The spiral arms of the galaxies are the the main production centres of young stars. The more gas and the dust available, the greater the fraction of the galaxy that can be involved in the star formation. These high-production galaxies actually tend to be dominated by their spiral arms and have relatively small central bulges. Their arms contain actually more clusters of very luminous stars and the more luminous nebulae (HII regions).
Hence, the biomass which are more likely to find within (or on the edges of) spiral arms of a spiral galaxy than in between these arms is dense, dusty gas clouds.
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