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6.4 – Geologic and Geochemical Constraints on Earth's Early Atmosphere
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Chemical evolution and early Earth's and Mars' environmental conditions 1
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Life originated more than 3.5 billion years ago either on Earth or on our neighbour planet Mars from where it reached Earth by lithopanspermia. Life’s origin was preceded by an abiotic chemical…
Detecting the oldest geodynamo and attendant shielding from the solar wind: Implications for habitability
- Geology, Physics
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Atmospheric Prebiotic Chemistry and Organic Hazes
- Environmental ScienceCurrent organic chemistry
- 2013
The results highlighted here show that a variety of products can be formed in mildly reducing or even neutral atmospheres, demonstrating that contributions of atmospheric synthesis to the organic inventory on early Earth should not be discounted.
Organic Haze as a Biosignature in Anoxic Earth-like Atmospheres
- Geology, PhysicsAstrobiology
- 2018
It is shown that organic haze formation requires methane fluxes consistent with estimated Earth-like biological production rates and detection of haze at an anomalously low CH4/CO2 ratio could suggest the influence of these biogenic sulfur gases and therefore imply biological activity on an exoplanet.
Evidence for elevated and variable atmospheric oxygen in the Precambrian
- Environmental Science, Geography
- 2020
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