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奥尔特云
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奥尔特云
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哈雷彗星
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奥尔特云
1950年,荷兰天文学家J.H.奥尔特根据长周期彗星的轨道特征,认为在离太阳2000~200000个天文单位(AU)处有一个笼罩太阳系的球状包层,其中分布以千亿计的小天体,那里是长周期彗星和哈雷族彗星的诞生地。
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奥尔特云
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