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18 天
NASA的运算结果表明 奥尔特云可能是类似于微型星系的螺旋状结构
在冥王星轨道之外,有一片神秘的区域,那里布满了环绕太阳的冰冻天体。 这个遥远的区域被称为奥尔特云(Oort Cloud),至今仍不为人知,但人们可以从偶尔向内飞行的长周期彗星推断出它的存在。
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