The Early Earth as an Analogue for Exoplanetary Biogeochemistry

Eva E. Stüeken, Stephanie L. Olson, Eli Moore, Bradford J. Foley
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Abstract

Planet Earth has evolved over the past 4.5 billion years from an entirely anoxic planet with possibly a different tectonic regime to the oxygenated world with horizontal plate tectonics that we know today. For most of this time, Earth has been inhabited by a purely microbial biosphere albeit with seemingly increasing complexity over time. A rich record of this geobiological evolution over most of Earth’s history thus provides insights into the remote detectability of microbial life under a variety of planetary conditions. Here we leverage Earth’s geobiological record with the aim of (a) illustrating the current state of knowledge and...
将早期地球作为系外行星生物地球化学的模拟对象
在过去的 45 亿年里,地球从一个完全缺氧的星球,可能还有不同的构造体系,演变成今天我们所知道的水平板块构造的含氧世界。在这期间的大部分时间里,地球上一直居住着纯粹的微生物生物圈,尽管随着时间的推移,其复杂性似乎在不断增加。因此,地球历史上大部分时间的这种地球生物演化的丰富记录,为在各种行星条件下远程探测微生物生命提供了启示。在这里,我们利用地球的地球生物学记录,目的是(a)说明目前的知识水平和...
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