Dark matter

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Dark matter is a hypothetical form of matter that does not interact with light or other electromagnetic radiation. Dark matter is implied by gravitational effects which cannot be e xplained by general relativity unless more matter is present than can be observed. Such effects occur in the context of formation and evolution of galaxies,gravitational lensing, the observable universe's current structure, mass position in galactic collisions,[3] the motion of galaxies within galaxy clusters, and cosmic microwave background anisotropies. Show more