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双星闪耀:两颗绿色彗星点亮北半球夜空

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两颗明亮的绿色彗星——莱蒙彗星和天鹅座彗星——正在为北半球的夜晚增添光彩。莱蒙彗星将于周二左右接近地球,而天鹅座彗星将于周一从太阳附近飞过,届时它正远离太阳并逐渐暗淡。专家称这种双重天象虽然罕见,但并非前所未有。日落后不久观察:莱蒙彗星位于北方低空,天鹅座彗星位于西南方低空。两者都可以通过双筒望远镜一直看到本月底,但其亮度尚不确定。这些彗星很可能来自太阳系遥远之处,因释放气体而呈现绿色,但在地球上看来,它们像是灰色、模糊的斑块。

Prepared by Olivia Bennett and reviewed by editorial team.

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