When the Milky Way or any galaxy develosp new stars, they are usually formed inside of vast gas clouds into star clusters. We usually call these open star clusters.
In these open clusters of stars, we find a diversity of stellar types. Some stars are small, cool and dim. Some are like our Sun, just your average star. Others though possess ten times or more the mass of our Sun and shine hundreds of thousands of times brighter. These stars also have a much shorter lifespan.
When we look at a galaxy, we find that the differences in mass in these open clusters has a significant impact on how bright the galaxy is. If for example, a dwarf galaxy has a total mass that is low, it won't produce any really extremely massive stars that are brighter than our Sun.
This raised a question if the actual mass of individual stars in cluster is a matter of chance or not. The video looks into the answer to that question and the article and link to the research paper are over at Eadsy Astronomy
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