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Magma from the & # 39 is the key to the makeup of the Moon


For more than a century, scientists have debated how the Earth formed month. But researchers from Yale University in Japan say that they may have the answer.

Many theorists believe a & # 39; object the size of Mars slammed into Earth early, and the material is pushed out of this encounter, formed the basis of the Moon. If this idea was tested in computer simulation, it turned out that a month will be done primarily on the impact of the & # 39 object. But the opposite is true; we know from the analysis of rocks brought back from the Apollo missions, that the moon consists mainly of material from Earth.

A new study published April 29 in Nature Geoscience, in collaboration with Yale geophysicist Shun-Ichiro karate, offers an explanation.

The key, Karato says that early proto-Earth – about 50 million years after the formation of the Sun – was covered by the sea of ​​hot magma, while acting on the & # 39; the object was probably made of solid material. Karato and his colleagues decided to test a new model based on the collision of proto-Earth is covered by oceans of magma and solid on the & # 39 object impact.

The model showed that after the collision, the magma heats up much more than solids from the effects of the & # 39 object. Magma is then expanded in a & # 39; the volume and goes into orbit to form the moon, the researchers say. This explains why there is a lot more material in the makeup of the Earth Moon. Previous models do not take into account a different degree of heating between the proto-earth silicates and drummer.

numerical simulation of the formation of the Moon shooting giant impact.
numerical simulation of the formation of the Moon shooting giant impact. The central part of the image of the proto-Earth; red dots show the materials from the ocean of magma in the proto-Earth; blue dots show the impactor material.

"In our model, about 80% a month is made from materials of the proto-Earth," said Karato, who has done extensive research of the chemical properties of the magma of the proto-Earth. "In most of the previous models, about 80% of the Moon consists of a drummer. It's a big difference. "

Karato said that the new model confirms previous theories about how the moon formed, without the need to provide non-standard conditions of clashes – the theorists had to do so far.

Karato for research studies conducted in the compression of the molten silicate. The group from the Tokyo Institute of Technology and RIKEN Center for Computational Sciences has developed a computer model to predict how material from the collision became the moon.

The first author of the study from the & # 39 is Natsuki Hosono with RIKEN. Additional co-authors Junichiro Makino and Takayuki Saitoh.

/ University Release. View the full & # 39; the volume here.

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