dark matter
US /dɑːrk ˈmæt.ər/
UK /dɑːrk ˈmæt.ər/
1.
non-luminous material that is postulated to exist in space and that could take the form of neutrinos or other elementary particles.
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Scientists are still trying to understand the nature of dark matter.
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The existence of dark matter is inferred from its gravitational effects on visible matter.