Sterile neutrinos are another candidate. Neutrinos are particles that do not make up normal matter. A stream of neutrinos gushes from the sun, but because they rarely interact with normal matter, they pass through the Earth and its inhabitants. There are three known types of neutrinos; A quatrino, the sterile neutrino, is proposed as a candidate for dark matter. The sterile neutrino would interact with normal matter only by gravity. Dark matter can be divided into cold, hot and hot categories.  These categories refer to velocity rather than actual temperature, and indicate how far the corresponding objects moved due to random motions in the early universe before slowing down due to cosmic expansion – an important distance called free flow length (FSL). Primordial density fluctuations below this length are wiped out when particles propagate from overdense to underdense regions, while larger fluctuations are not affected; Therefore, this length sets a minimum standard for the subsequent formation of the structure. The mention of dark matter is made in works of fiction. In such cases, extraordinary physical or magical properties are usually attributed to it. Such descriptions often contradict the hypothetical properties of dark matter in physics and cosmology.
A special case of direct detection experiments includes those with directed sensitivity. This is a research strategy based on the motion of the solar system around the galactic center.     A low-pressure time projection chamber provides access to information on recoil traces and restricts the kinematics of the WIMP core. WIMPs from the direction in which the sun is moving (approximately towards Cygnus) can then be separated from the background, which should be isotropic. Experiments directed with dark matter include DMTPC, DRIFT, Newage, and MIMAC. They do this by measuring the effect of dark matter on ordinary matter through gravity. Other instruments look for the effects of dark matter. The European Space Agency`s Planck spacecraft has been building a map of the universe since its launch in 2009. By observing how the mass of the universe interacts, the spacecraft can study both dark matter and its partner, dark energy. If dark matter is composed of subatomic particles, then millions, if not billions, of those particles must pass through every square inch of the Earth every second.
  Many experiments are aimed at testing this hypothesis. Although WIMPs are popular research candidates, the Axion Dark Matter Experiment (ADMX) looks for axions. Another candidate is the heavy particles of the hidden sector that interact with ordinary matter only by gravity. Depending on temperature and other conditions, matter can occur in one of many states. At normal temperature, for example, gold is a solid, water is a liquid, and nitrogen is a gas, as defined by certain properties: solids retain their shape, liquids take the shape of the container that contains them, and gases fill an entire container. These states can be classified into subgroups. For example, solids can be divided into crystalline or amorphous solids, or metallic, ionic, covalent, or molecular solids depending on the types of bonds that hold the constituent atoms together. The less clearly defined states of matter are plasmas, which are ionized gases at very high temperatures; foams that combine aspects of liquids and solids; and clusters, which are arrangements of a small number of atoms or molecules that have both atomic and voluminous properties. Most scientists believe that dark matter is composed of non-baryonic matter.
The main candidate, WIMPS (Weak Interaction Massive Particles), has ten to one hundred times the mass of a proton, but their weak interactions with “normal” matter make them difficult to detect. Neutralinos, hypothetical massive particles heavier and slower than neutrinos, are the main candidates, although they have not yet been discovered. Dark matter is not the same as dark energy. Dark energy accounts for about 68% of the universe according to the Standard Model. Following Zwicky, Vera Rubin postulated that the missing structure in galaxies is dark matter. Their ideas met with much opposition in the astronomical community, but their confirmed observations now provide crucial evidence for the existence of dark matter. In honor of this crucial and historic detective work in determining the existence of dark matter, the revolutionary Large Synoptic Survey Telescope was recently named the Vera C. Rubin Observatory. About 80% of the mass of the universe is made up of materials that scientists cannot observe directly. Known as dark matter, this bizarre ingredient emits neither light nor energy. Why do scientists believe it dominates? All of these methods provide a strong indication that most of the matter in the universe is something still invisible.
To push the link between matter and radiation a step further, theorists also suggest that mysterious radiation exists in our universe. This is called dark energy. Its nature is not understood at all. If we understand dark matter, perhaps we will also understand the nature of dark energy. The constituents of cold dark matter are unknown. The possibilities range from large objects such as MACHOs (such as black holes and Preon stars) or RAMBO (such as brown dwarf clusters) to new particles such as WIMPs and axions. The approach taken by astronomers is to remove particles that cannot be dark matter, in the hope that we will be left with the one that is. The dark matter hypothesis has an elaborate history.  In an 1884 lecture, Lord Kelvin estimated the number of dark bodies in the Milky Way from the observed velocity dispersion of stars orbiting the center of the galaxy. With these measurements, he estimated the mass of the galaxy, which differs from the mass of visible stars.
Lord Kelvin concluded that “many of our stars, perhaps a large majority of them, could be dark bodies”.   In 1906, Henri Poincaré used the French term matière obscure in “The Milky Way and the Theory of Gases” to discuss Kelvin`s work.   The possibility that primordial atom-sized black holes constitute a significant portion of dark matter has been ruled out by measurements of positron and electron fluxes outside the Sun`s heliosphere by the Voyager 1 spacecraft. Tiny black holes are theorized to emit Hawking radiation. However, the detected fluxes were too weak and lacked the expected energy spectrum, suggesting that the tiny primordial black holes are not widespread enough to explain dark matter.  Nevertheless, research and theories proposing dense dark matter for dark matter will continue from 2018, including dark matter cooling approaches, and the question remains unresolved. In 2019, the absence of microlensing effects in the Andromeda observation suggests that tiny black holes do not exist.  Although dark matter makes up most of the matter in the universe, it makes up only about a quarter of the universe`s total composition. The energy of the universe is dominated by dark energy. Bottom Line: According to astronomical theories, dark matter makes up about 27% of the universe.
Astronomers` existing tools cannot see or recognize it. However, its gravitational pull on ordinary matter allows astronomers to measure it. As with the rotation curves of galaxies, the obvious way to resolve the gap is to postulate the existence of non-luminous matter. These experiments can be divided into two classes: direct detection experiments, which seek the scattering of dark matter particles from atomic nuclei in a detector; and indirect detection, which looks for the products of particle annihilation or dark matter decay.  At this point, however, there are still possibilities of dark matter that are achievable.