A new study suggests that Earth’s ancient atmosphere may have played a much more active and crucial role in generating the chemical ingredients for life than previously thought, specifically demonstrating that the young planet’s sky could have been creating sulfur-based organic molecules known to be vital components for life.
Learn how sulfur-based molecules essential to life may have formed before the first living systems appeared. https://t.co/boatGc1iEc
— Discover Magazine (@DiscoverMag) December 2, 2025
This discovery challenges the long-held belief that complex organic sulfur molecules, like those found in amino acids, only formed after life had already taken hold and constructed them.
The research, published in Proceedings of the National Academy of Sciences, showed that previous attempts to simulate early Earth conditions often failed to generate substantial sulfur biomolecules without stringent requirements. However, the new experiments successfully simulated atmospheric conditions from before life began by irradiating a mixture of simple atmospheric gases: methane, carbon dioxide, hydrogen sulfide, and nitrogen.
Using a sensitive spectrometer, the researchers identified that their early Earth simulation produced an extensive range of sulfur molecules, including the amino acids cysteine and taurine, and coenzyme M, all of which play a central role in metabolism.
Their calculations suggest that the early atmosphere could have produced enough cysteine, which may have fallen to the surface via rainfall, to support around one million cells.
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This indicates that more complex molecules could have spread under ordinary conditions, suggesting life didn’t have to start completely from scratch and might have had an easier time taking hold.
