Dark matter definition

Dark matter

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noun

(1) (cosmology) a hypothetical form of matter that is believed to make up 90 percent of the matter in the universe; it is invisible (does not absorb or emit light) and does not collide with atomic particles but exerts gravitational force

WiktionaryText

Noun

dark matter

particles of matter that cannot be detected by their radiation but whose presence is inferred from gravitational effects