A new paper uses laboratory simulations of an Earth impact as evidence that a stratified layer beneath the rocky mantle — which appears in seismic data — was created when the Earth was struck by a smaller object. The authors argue this was the same impact that sent a great mass of debris hurtling into space, creating the moon. Credit: © Gudellaphoto / Fotolia
A layer of iron and other elements deep underground is the evidence scientists have long been seeking to support the hypothesis that the moon was formed by a planetary object hitting the infant Earth some 4.5 billion years ago, a new study led by Johns Hopkins University scientists argues...
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