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dark matter

Noun dark matter has 1 sense
  1. dark matter - (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
    --1 is a kind of
    substance, matter
    --1 has parts: weakly interacting massive particle, WIMP
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