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Definition of dark matter noun from the Oxford Advanced Learner's Dictionary

dark matter

noun

/ˌdɑːk ˈmætə(r)/

/ˌdɑːrk ˈmætər/

[uncountable] (astronomy)

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according to some theories, material that exists in space but does not reflect any lightTopics Spacec2, Physics and chemistryc2

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