Redox state of Earth’s magma ocean and its Venus-like early atmosphere – Science Advances

INTRODUCTION
Earths present-day N2-O2 atmosphere differs markedly from those of her planetary neighbors, Venus and Mars, which both have CO2-rich atmospheres with minor N2 (1, 2). Models of their accretion suggest that the inner planets formed through an evolving hierarchy of solid-body size distributions, the terminal stages of which saw giant collisions between roughly Mars-sized planetary embryos (3). A small fraction of these embryos may have been sourced from the outer solar system and are…

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