The dusty disks that orbit young stars are the cradles of planets. They form along with the star and contain tiny grains of dust floating through huge amounts of gas. Once in a while two or more of these dust grains meet each other and can clump together, paving the way towards the formation of larger and larger bodies, and eventually planets. Since all of this happens in a bath of gas, understanding the physical conditions and motions of the gas is key to understanding how the dust grains move through it, and therefore the dynamics of dust collisions.
https://public.nrao.edu/blogs/studying-the-cradle-of-planets-with-ngvla/
National Radio Astronomy Observatory
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Northridge