Stephanie Pappas is a contributing writer for Live Science, covering topics ranging from geoscience to archaeology to the human brain and behavior.
The remnants of a protoplanet that slammed into Earth and created the moon may still be lurking deep in our planet's mantle.
Together, the blobs make up about 4% of the mantle. One is beneath Africa and the other is beneath the Pacific Ocean. For the new study, published today in the journal Nature Climate Change, Yuan collaborated with planetary scientists to simulate the moon-forming impact, its effect on the mantle and how remnants of the impacting body would have circulated in the mantle over the next 4.5 billion years. They first found that the impact of Earth with a body about the size of Mars — the accepted size of the impactor — would not have melted the entire mantle, only the upper half.
"Because it has a higher density, it will allow it to stay above Earth’s core-mantle boundary for 4.5 billion years," Yuan said.
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