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Oort cloud - Wikipedia, the free encyclopedia
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日期:2025-04-12
The Oort cloud (/ˈɔrt/ or /ˈʊərt/[1]) or Öpik–Oort cloud,[2] named after Dutch astronomer Jan Oort and Estonian astronomer Ernst Öpik, is a spherical cloud of predominantly icy planetesimals believed to surround the Sun at a distance of up to 50,000 AU (0...看更多