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1. Oxford American Dictionary

   dark matter

   • IPA[ˌdärk ˈmadər]

   美式

   • n.
     (in some cosmological theories) nonluminous material that is postulated to exist in space and that could take any of several forms including weakly interacting particles (cold dark matter) or high-energy randomly moving particles created soon after the Big Bang (hot dark matter).

   • noun: dark matter

2. • 更多解釋

   dark matter

   • IPA[ˌdɑːk ˈmatə]

   英式

   • n.
     (in some cosmological theories) non-luminous material that is postulated to exist in space and ...

   Oxford Dictionary