Measurements of potassium in lunar and terrestrial rocks have disproved the leading hypotheses for the origin of Earth’s sole natural satellite

Two recent models for the formation of the Moon, one that allows exchange through a silicate atmosphere (top), and another that creates a more thoroughly mixed sphere of a supercritical fluid (bottom), lead to different predictions for potassium isotope ratios in lunar and terrestrial rocks (right). Image credit: Kun Wang.

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