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    Image result for オールトの雲
    Oort cloud
    Trans-neptunian region
    The Oort cloud, named after the Dutch astronomer Jan Oort, sometimes called the Öpik–Oort cloud, is a theoretical cloud of predominantly icy planetesimals proposed to surround the Sun to as far as somewhere between 50,000 and 200,000 AU. Wikipedia
    Discoverer: Jan Oort