Standard cosmological models of the universe predict the existence of hundreds of dwarf galaxies in orbit around the Milky Way, but their dimness and small size makes them incredibly difficult to find, even in our own «backyard». (astrobio.net)
In a study in the journal Nature, researchers show that the relative lack of star density in dwarf galaxies need not conflict with standard cosmological models if you include the blast effects of supernovae. (scientificamerican.com)
But still not enough to align with predictions based on standard cosmological models. (sciencedaily.com)