The protoplanets that collided to make the Earth may themselves have had atmospheres and oceans. Venus has vastly more argon and neon than Earth: fossil evidence, perhaps, of protoplanetary atmospheres?
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Zahnle, K. Being there. Nature 433, 814–815 (2005). https://doi.org/10.1038/433814b
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DOI: https://doi.org/10.1038/433814b
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