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Cataclysm No More: New Views on the Timing and Delivery of Lunar Impactors.
Origins of Life and Evolution of Biospheres ( IF 2 ) Pub Date : 2017-05-05 , DOI: 10.1007/s11084-017-9536-3
Nicolle E B Zellner 1
Affiliation  

If properly interpreted, the impact record of the Moon, Earth's nearest neighbour, can be used to gain insights into how the Earth has been influenced by impacting events since its formation ~4.5 billion years (Ga) ago. However, the nature and timing of the lunar impactors - and indeed the lunar impact record itself - are not well understood. Of particular interest are the ages of lunar impact basins and what they tell us about the proposed "lunar cataclysm" and/or the late heavy bombardment (LHB), and how this impact episode may have affected early life on Earth or other planets. Investigations of the lunar impactor population over time have been undertaken and include analyses of orbital data and images; lunar, terrestrial, and other planetary sample data; and dynamical modelling. Here, the existing information regarding the nature of the lunar impact record is reviewed and new interpretations are presented. Importantly, it is demonstrated that most evidence supports a prolonged lunar (and thus, terrestrial) bombardment from ~4.2 to 3.4 Ga and not a cataclysmic spike at ~3.9 Ga. Implications for the conditions required for the origin of life are addressed.

中文翻译:

大灾变:关于月球撞击者的时间和传送的新观点。

如果正确解释,月球(地球最近的邻居)的撞击记录可用于深入了解自45亿年前形成以来,地球受到撞击事件的影响。但是,人们对月球撞击器的性质和时间以及月球撞击记录本身的了解还不够。特别令人感兴趣的是月球撞击盆地的年龄,以及它们对拟议的“月球大灾难”和/或后期重磅轰炸(LHB)告诉我们的内容,以及这种撞击事件可能如何影响地球或其他行星的早期生命。随着时间的推移,已经对月球撞击者种群进行了调查,其中包括对轨道数据和图像的分析;月球,地球和其他行星样本数据;和动力学建模。这里,审查了有关月球撞击记录性质的现有信息,并提出了新的解释。重要的是,已证明大多数证据支持将月球(因此,对地面)的轰炸时间从4.2 Ga延长至3.4 Ga,而不是在3.9 Ga时发生灾难性的尖峰袭击。解决了生命起源所需要的条件。
更新日期:2019-11-01
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