NASA ScienceCasts: 在天空星(2014 MU69)看太阳系历史的起源。

科学家在名为天空星2014 MU69的柯伊伯带天体中解读太阳系的起源。 NASA Science: http://science.nasa.gov/ 点击这里查看更多视频:https://alugha.com/NASA

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