The hypothetical particle that makes up the majority of the universe is called dark matter. Dark matter is an invisible form of matter that does not interact with light or electromagnetic radiation, hence the term "dark." It cannot be directly observed or detected through traditional methods of observation.
The presence of dark matter is inferred from its gravitational effects on visible matter and the large-scale structure of the universe. It is believed to make up a significant portion of the total mass in the universe, far exceeding the mass of visible matter (stars, planets, galaxies, etc.). Dark matter is thought to play a crucial role in the formation and evolution of galaxies and the overall structure of the universe.
Despite its influence, the exact nature of dark matter remains a mystery. Various theoretical models propose different types of particles that could potentially make up dark matter, such as weakly interacting massive particles (WIMPs) or axions. However, to date, no direct detection of dark matter particles has been made, and ongoing scientific efforts are focused on uncovering its true nature and properties.