这颗“千年等一回”的彗星即将远去,且看且珍惜!|黄瓜视频APP视频免费观看

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  11月8日,今年以来最亮彗星——莱蒙彗星将通过近日点,到达距离太阳最近的位置,迎来它在本次太阳系旅程中的最活跃时刻。届时,这颗千年一遇的彗星上演的“最后一舞”是否依然精彩,让我们拭目以待。

  莱蒙彗星今年1月被发现,其轨道周期约为1150年至1350年,是一颗长周期彗星。长周期彗星指的是轨道周期超过200年的一类周期彗星。

  对于一颗彗星来说,过近日点就像经历一次“生死劫”。星联CSVA联合发起人蒋晨明解释说,彗星由冰、尘埃和其他化合物组成。在飞向太阳的过程中,主要由冰块和碎片组成的彗核,越接近太阳,其受太阳辐射和太阳风的作用就越强,融化分解的速度就越快,很容易解体,甚至是彻底蒸发。

  如果经受住太阳的“烤”验,彗核会进一步升华,喷涌出大量的气体和尘埃,进而形成明亮的彗发和长长的尾巴,成为天空中一道靓丽的风景线;反之,如果没有经受住太阳的“烤”验,可能一下子就没了。

  相较于有些彗星先过近日点再过近地点,莱蒙彗星则是先过近地点再过近日点。在10月21日过近地点后,莱蒙彗星加速向太阳飞去。目前来看,这颗彗星的表现还算平稳和正常。

  “从过近地点前后以来,莱蒙彗星与我们共享了一段美好的时光,在北半球,它与雪山为伴,与银河同框,与流星共舞,给我们留下了无数个浪漫的精彩瞬间。”蒋晨明说。

  如果顺利通过近日点,莱蒙彗星也不会停留太久,它会在我们的视野中渐行渐远,最终消失在茫茫星际。

  “莱蒙彗星在过近日点前后的预报亮度在4-5等左右。日落后会出现在西方低空,仍有观测机会。在8日前后一段时间内,感兴趣的公众尽可能远离城市,到无灯光影响且视野开阔的场所,如郊外、农村、山顶等,借助小型天文望远镜或双筒望远镜再看一眼这位‘天外来客’。挥手道别之际,希望千年以后它还能再次回归,做客地球。”蒋晨明说。(新华社 记者 周润健)

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