How does the spatial distribution of dust compare to that of diffuse gas in the disk?

Answer

The sheer volume of diffuse hydrogen gas spreads across a much larger, fainter area, whereas dust is clumped into denser, obscuring patches.

The gas component is far more massive and spreads widely, creating a faint background, whereas the dust concentrates in denser, clumpy regions that effectively block visible light.

How does the spatial distribution of dust compare to that of diffuse gas in the disk?
galaxyastronomyspiral galaxygasdust