In contrast, it is not known what kind of particles comprise dark matter. Luminous matter can be stars, glowing gas in nebulae, or even planets, but regardless of the form, all known luminous matter is composed of the particles of the Standard Model: quarks, electrons, photons, and so on. In general, the matter in the universe can be classified into two categories: luminous matter which emits and absorbs light, and dark matter which neither absorbs nor emits light.
Explaining the physical nature and spatial distribution of dark matter in the universe is one of the main open issues in contemporary physics. Instead, astronomers and cosmologists infer the existence of dark matter due to its gravitational influence on visible matter. Visible stars are not the only matter in space in fact, the majority of matter in the universe is known as dark matter due to the fact that it cannot be directly observed.
0 kommentar(er)
