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Oort cloud /nɔːwˈiːdʒən ˈsiː/ n

中文：奥尔特云

中文 · 奥尔特云Español · nube de OortFrançais · nuage de Oort
Meaning：Region of space bordering the solar system about 50,000 astronomical units from the Sun; composed of billions of comets.
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Outer planets

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