Relativity
Dark matter is a mysterious and invisible substance that makes up approximately 27% of the universe's total mass-energy content, influencing the gravitational behavior of galaxies and galaxy clusters. It does not emit, absorb, or reflect light, making it undetectable by conventional means, but its presence is inferred from its effects on visible matter, radiation, and the large-scale structure of the universe. Understanding dark matter is crucial for explaining phenomena in astrophysics and cosmology, particularly how galaxies form and evolve.
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