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 Definition of 'dark matter':

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



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"dark matter." Definitions.net. STANDS4 LLC, 2008. 7 September. 2008. http://www.definitions.net/definition/dark matter
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