Shulou(Shulou.com)11/24 Report--

CTOnews.com, Nov. 2 (Xinhua) physicists discovered in the 1980s that there were two giant spots in the mantle, one below the African continent and the other under the Pacific Ocean.

Each spot is twice the size of the moon and its constituent elements are different from the surrounding mantle, and scientists later officially named it the large low wave velocity domain (LLVP).

So where did these LLVP come from? After in-depth research, the team from the California Institute of Technology believes that the LLVP is the "wreckage" of an ancient planet.

Scientists believe that billions of years ago, the planet collided violently with Earth, some of which went into the mantle and the other into space to form the moon.

Researchers have always had a big collision theory (Giant impact hypothesis): the hypothesis is that in the Paleozoic about 4.5 billion years ago, the newly formed early Earth collided with a Mars-sized dwarf planet in the same orbit, and the two fused to form Earth again, while part of the early Earth's crust and mantle were torn away into a stable orbit and then independently accreted to form the moon. The object that hit the earth is called Theia, named after the Titan mother of Selene, the god of the moon in Greek mythology.

The results show that most of the material from Theia is absorbed into the young Earth to form LLVP, while the remaining debris from the impact condenses to form the moon.

CTOnews.com encloses the address of the paper: Yuan, Q., Li, M., Desch, S.J. Et al. Moon-forming impactor asa source of Earth's basal mantle anomalies. Nature 623,95-99 (2023). Https://doi.org/10.1038/s41586-023-06589-1

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