In the bowels of the Earth traces the many other planets

Techno 6 December, 2017

2017-12-05 10:48

In the bowels of the Earth traces the many other planets
Built computer models of how the newborn Earth was confronted with other celestial bodies, and how their metals and silicates was mixed with the mother planet at the time, which we call the “era of the late accretion”

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Newborn Earth “ate” some of the nuclei of the planets after its collision with Theia, the progenitor of the moon, the traces of which geologists have found in the oldest rocks of the planet in Greenland, reports Rus.Media.

“We built a computer model of how the newborn Earth has collided with other celestial bodies, and how their metals and silicates was mixed with the mother planet at the time, which we call the “era of the late accretion”. These calculations indicate that the depths of the Earth contain far more of this matter than is believed by our colleagues. This greatly changes the history of its evolution,” said Simone MArchI (Simone Marchi) from the southwest research Institute in Bodera (USA).

Mysteries Of The Moon

The last 30 years, it was assumed that the Moon formed as a result of collision theis, protoplanetary body, with the “germ” of the Earth. The impact resulted in the ejection of matter theis and proto-Earth to space, from this material formed the Moon. Theory of collision of proto-Earth with a large celestial body explains well the mass of the moon, the low iron content therein, and other parameters.

However, this clash is a significant part of the material, which is a Month, was supposed to bring hypothetical Theia. In its composition it had to be different from the Earth, as different from her most celestial bodies in the inner Solar system, including terrestrial planets and asteroids. But in fact, the composition of the Earth and moon are very similar, down to the same proportion of isotopes of many metals and other elements.

Despite all the advantages of this hypothesis, it has some serious drawbacks. For example, in accordance with this idea, all water supplies have been fully evaporate from matter next Month in the moment when she was thrown into space after a collision theis and Earth.

Six years ago, many astronomers began to doubt it, as the particles of water in some rock samples brought to Earth of the expedition “Apollo-15 and Apollo-17”, was higher than the theoretically calculated values hundreds of times. Other scientists have suggested that NASA astronauts came across some “water anomaly”, analogues of which the moon may not be.

MArchI and his colleagues suggest that almost all of these anomalies could be generated by the fact that the Earth is faced not only with Theia, but many other nuclei of the planets, a significant part of the matter which now lurks in the bowels of our planet.

Traces of cosmic meal

They came to this conclusion by creating a computer model of the newborn Solar system, which was populated not only the Earth and Moon, but many planetesimals, “dead” embryos of planets, periodically faced with our planet and other celestial bodies.

Today scientists believe, the Earth had to go through dozens or even hundreds of such collisions. Most of the matter of such nuclei of the planets was supposed to evaporate into space or be discarded during the collision with the Ground, resulting in only 0.5% of its weight falls on the matter of other worlds.

The calculations of the team of MArchI have shown that it is not. If even a small part of these planetesimals was big enough, more than 1500 kilometers in diameter, then the Earth’s interior consist of approximately 2.5-3% from rocks formed in the depths of other planets.

How to find traces of these planets? According to geologists, the strength of these collisions was high enough that the crust and the mantle is completely melted and mixed with the “high” species, but it was enough to ensure that the fragments of the former nucleus of the planet penetrated to a greater depth.

This means that in the depths of the planet to meet region with abnormal proportions of isotopes of various metals such as tungsten and hafnium, as well as the unusual silicate rocks, the analogues of which do not exist anywhere else on the planet. How do you think MArchI and his colleagues, their deposits are found in Greenland, in the so-called Greenstone belt.

Here, according to them, often find unique breed-komiteti that contain an abnormally high proportion of tungsten-182 and have an unusual structure, found nowhere else on Earth. Their study, according to MArchI, will help us to understand how many other planets have “eaten” the Earth and how it looked in the first moments of his life.