Cold Dark Matter (CDM)

Cold Dark Matter (CDM) refers to a theoretical form of matter that does not emit, absorb, or reflect light, making it invisible and detectable only through its gravitational effects. It is "cold" because it moves slowly compared to the speed of light, allowing it to clump together, forming structures like galaxies. CDM is a crucial component of the prevailing cosmological model, explaining phenomena such as the rotation rates of galaxies and the distribution of galaxies in clusters. Understanding CDM helps scientists grasp the universe's composition and evolution, influencing theories about its fate and the formation of cosmic structures.