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2020年圣诞星:木星,土星在罕见的“大同伴”中相遇

星期一晚上,我们太阳系中最大的两个行星木星和土星将合并为一个单一的光源。它's the first visible conjunction of the giants in more than 800 years. Correspondent Mark Strassmann explains why we may not have another chance to see such an astronomical sight in your lifetime.
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