Scientists have long agreed that the Moon formed when a protoplanet, called Theia, struck Earth in its infancy some 4.5 billion years ago. Last year, a team of scientists presented a provocative new proposal. ScienceMagArchives
Scientists have long agreed that the Moon formed when a protoplanet, called Theia, struck Earth in its infancy some 4.5 billion years ago. Now, a team of scientists has a provocative new proposal: Theia's remains can be found in two continent-size layers of rock buried deep in Earth's mantle.
The large low-shear velocity provinces , as seismologists call them, might simply have crystallized out of the depths of Earth's primordial magma ocean. Or they might be dense puddles of primitive mantle rock that survived the trauma of the Moon-forming impact. But based on new isotopic evidence and modeling, Yuan believes the LLSVPs are the guts of the alien impactor itself.
In studies of Apollo Moon rocks, Desch and his colleagues measured the ratios of hydrogen to deuterium, a heavier hydrogen isotope. Light hydrogen was far more abundant in some of the Moon samples than in Earth rocks, they found. To capture and hold onto so much light hydrogen, Theia must have been massive, they proposed in a.
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