The combination of the type of Earth-Moon system is indeed very rare

Approximately 4, 53 billion years ago, after 300 million years after the formation of our solar system, the Earth experienced a large space body the size of Mars. Due to the collision of the Earth in the form of dust and debris separated a significant part of the mantle and crust, which eventually merged into a single body - the moon.

How often such a combination, like the Earth and the Moon, found in space?

According to a new study , published in the journal «Icarus», such is found only rarely.

Using a simulation on a supercomputer, the authors calculated the scientific work of approximately 150 models to simulate the formation of Earth-like planets in orbit around the sun. They concluded that the chances of a collision, resulting in the formation of steam such as Earth-Moon system, ranging from 5% to 8%.

"Based on our calculations, we can recognize it unlikely that other analogs of the Earth will have satellites like the moon, - says Nicolas Cowan (Nicolas Cowan), co-author of research and professor of astronomy at Amherst College (Massachusetts, USA). - We do not say that it is difficult to create the moon; we say that it is difficult to create the moon, which is similar in composition as the planet around which turns ».

Cohen explained on the theory, material protoplanetary disk from which the solar system was formed, was evenly distributed, depending on the distance to the sun. At the same time, the object collided with Earth formed far from the sun (known as Thea). Accordingly, its structure differed from the earth. According to the theory, the moon was to consist of about 90% of the contents of Thea and 10% of the proto-Earth. But scientists noticed that the composition of the moon almost completely corresponds to the earth. In principle, this fact is contrary to logic and common sense, still remains a mystery to scientists.

Perhaps our version of understanding of the Moon is fundamentally wrong, says Cowan.

Source: geektimes.ru/post/252652/