<P> Although the disk contains dust that obscures the view in some wavelengths , the halo component does not . Active star formation takes place in the disk ( especially in the spiral arms , which represent areas of high density ) , but does not take place in the halo , as there is little gas cool enough to collapse into stars . Open clusters are also located primarily in the disk . </P>
where does most star formation take place in the milky way
the spiral arms the disk