There is a remarkably strong contrast between the strongly crater-like opposite side of the moon and the lower-lying open pelvis of the earth-facing area. And scientists now believe that they have solved the decade-old lunar mystery. New evidence from the US space agency NASA suggests that an ancient collision between the moon and another celestial object was responsible for the one-sided lunar surface.
The new investigations suggest a collision between the Moon and a moon-sized dwarf planet at an early stage. The solar system is the best explanation.
The difference between the earth-facing side of the moon and the rough side of the moon has been discussed since NASA's Apollo era.
Scientists had previously assumed that the earth had two billion moons. Years ago, they fused into an uneven surface that can be seen today.
Measurements carried out in 201
The off-moon side has a crust thicker than the near side, containing an extra layer of material, while the near side has a thinner and smoother crust.
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Dr. Meng Hua Zhu, co-author of the study, said, "GRAIL's detailed gravity data has given new insights into the structure of the lunar crust beneath the surface.
The Macau University of Science and Technology team Hua Zhu performed hundreds of computer simulations of moon impacting the crust of today's moon.
The researchers found that the best solution was a large body about 780 km in diameter, which is thrown at 22,500 km / h into the near side of the moon.
The model shows that the impact would have taken on huge proportions of material that falls back on the lunar surface and buries the crust on the other side in 5 to 10 km (3 to 6 miles) debris.
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The model also p provides a good explanation for the unresolved differences in the isotopes of potassium, phosphorus and rare earth elements such as Tungsten-182 between the surfaces of the earth and the moon.
Macau University researchers wrote: "Our model can explain this isotope anomaly." Professor Steve Hauck of Case Western Reserve University added: "This is an article that will be very provocative.
"Understanding the origin of differences between opponents and the other side of the moon is a fundamental issue in lunar science.
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"Indeed, some planets have hemispheric dichotomies, but for the moon We have a lot of data to test models and hypotheses, so the implications of the work could probably be wider than just the moon.
Scientists hope to supplement their models with data from moon missions, including China's Chang & # 4; e-4 mission, which landed on the other side of the moon in January.
Analysis of data from the Chang'e-4 mission revealed substances from the Moon's interior on the surface of the crater where the probe landed.
This increases the burden of proof, pointing to an enormous collision about 3.9 billion years ago.
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