Baryon matter
In Cosmology, the baryon matter indicates all the matter made up of elementary particles called Baryon S. In practice, that corresponds to the Proton S, and the Neutron S, with which one implicitly associates the electron S (which are not baryons, but Lepton S) which compose the Atome S and the Molécule the visible S and all structures in the observable Univers (stars, Galaxie S, Galaxy cluster, etc).
The nonbaryon term of matter is frequently used, to describe any exotic matter shape other which baryons, leptons and photons. There most probably exists in the universe of the nonbaryon matter shapes. One of it is the black Matière, more abundant, which one thinks that it is made up of elementary particles not existing on Earth and very difficult to detect in experiments. It is not present in stars, but intervenes in the structure and dynamics and galaxies and of the galaxy clusters, without however emitting radiation.
The measurement of the abundance of the baryon matter, as its distribution in the universe is one of the major stakes of modern cosmology.
See too
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