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  1. Oxford Dictionary

    Oort cloud

    • IPA[ɔːt]

    英式

    • ph.
      a spherical cloud of small rocky and icy bodies postulated to orbit the sun beyond the orbit of Pluto and up to 1.5 light years from the sun, and to act as a reservoir of comets. Its existence was proposed by J. H. Oort.
    • 更多解釋

    Oort cloud

    • IPA[ôrt kloud]
    • ph.
      a spherical cloud of small rocky and icy bodies postulated to orbit the sun beyond the orbit of ...

    Oxford American Dictionary