Robert Lea is a science journalist in the U.K. who specializes in science, space, physics, astronomy, astrophysics, cosmology, quantum mechanics and technology. Rob's articles have been published in Physics World, New Scientist, Astronomy Magazine, All About Space and ZME Science.
Over 4.2 billion years ago, the moon turned itself inside out to create the lunar surface that has become familiar to humanity.
Related: Humans are changing the moon's surface so much it's entered a new geological era, scientists say Models of moon formation suggest the last remains of this giant lunar ocean crystallized into dense materials including ilmenite, a mineral rich in iron and titanium. Co-author and Peking University scientist Nan Zhang previously developed models that suggested a giant impact on the moon could have caused a dense layer of titanium-rich material beneath the crust to shift to its nearside. Once there, this material would have sunk, formed sheet-like slabs and cascaded to the interior of the moon, leaving a remnant beneath the crust in the form of intersecting bodies of dense titanium-rich deposits.
"Our analyses show that the models and data tell one remarkably consistent story," Liang said."Ilmenite materials migrated to the nearside and sunk into the interior in sheet-like cascades, leaving behind a vestige that causes anomalies in the moon's gravity field, as seen by GRAIL."
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