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Published online by Cambridge University Press: 04 August 2017
There are very good reasons to believe that every stellar clustering in the Milky Way is a star-forming region or at least that every association is such a region and the minor clusterings adjacent sub-regions.
Some star-forming clusterings are still active but it seems as if a majority should be burned-out. The problem is to estimate the total number of clusterings in the present Milky Way, de-activated and disintegrated as well as active.