What happened to the missing mass?

The "missing mass" refers to the discrepancy between the observed mass of the universe and the mass predicted by models of cosmic structure formation. This missing mass is largely attributed to dark matter, a non-luminous substance that does not emit or interact with electromagnetic radiation, making it undetectable by traditional means. It is believed to make up about 27% of the universe's total mass-energy content, while ordinary matter accounts for only about 5%. Ongoing research in cosmology aims to better understand the nature and distribution of dark matter to explain this missing mass.