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Dark matter is invisible because it does not significantly interact with electromagnetic radiation, but its gravitational influence is observed across cosmic scales.
Dark matter is a hypothetical, invisible form of matter that does not interact significantly with electromagnetic radiation, including light. Its existence is inferred from gravitational effects that cannot be explained by visible matter alone, including galaxy rotation curves, gravitational lensing, the motions of galaxies in clusters, the structure of the cosmic web, and anisotropies in the cosmic microwave background. It is thought to provide the gravitational framework on which galaxies and larger cosmic structures form. In the standard Lambda-CDM cosmological model, dark matter accounts for approximately 26.8% of the universe's total mass-energy content and about 85% of its matter. It is generally considered non-baryonic and interacts primarily through gravity, making it difficult to detect directly. Dark matter may be classified as cold, warm, or hot according to the velocities of its constituent particles, with cold dark matter currently favored because it best explains the gradual formation of cosmic structures. Leading candidate constituents include undiscovered particles such as WIMPs and axions, while primordial black holes remain an alternative possibility.
Dark matter is invisible because it does not significantly interact with electromagnetic radiation, but its gravitational influence is observed across cosmic scales.
It explains major observations such as flat galaxy rotation curves, gravitational lensing, galaxy-cluster dynamics, the Bullet Cluster, and the large-scale structure of the universe.
Dark matter makes up about 26.8% of the universe's mass-energy content and approximately 85% of all matter in the standard Lambda-CDM model.
Dark matter is commonly classified as cold, warm, or hot based on particle velocity and free-streaming length; cold dark matter is the preferred scenario.
The nature of dark matter remains unknown, with WIMPs, axions, and primordial black holes among the principal proposed candidates.
A hypothetical, non-luminous form of matter inferred from its gravitational effects on visible matter, light, and cosmic structure.
Matter that is not composed primarily of ordinary atoms made from protons and neutrons.
Dark matter consisting of relatively slow-moving particles that can cluster efficiently and support the formation of cosmic structures.
A graph showing the orbital speed of stars or gas at different distances from a galaxy's center, often providing evidence for dark matter.
The bending and distortion of light by gravity, allowing the mass distribution of invisible matter to be measured.
A proposed weakly interacting massive particle that could constitute dark matter.
A hypothetical very light particle proposed as a possible constituent of dark matter.
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